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VU Research Portal
Compound drivers of hydroclimatic extremes in large river basins
Khanal, Sonu
2021
document versionPublisher's PDF, also known as Version of record
Link to publication in VU Research Portal
citation for published version (APA)Khanal, S. (2021). Compound drivers of hydroclimatic extremes in large river basins: Mapping future floods andwater resources by modeling compound drivers at multiple spatial and temporal scales. ProefschriftMaken.
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Download date: 09. Feb. 2022
PhD Thesis
Compound drivers of hydroclimatic extremes in large river basins Mapping future floods and water resources by modeling compound drivers at multiple spatial
and temporal scales
Samengestelde oorzaken van overstromingen In kaart brengen van toekomstige overstromingen en watervoorraden door samengestelde
factoren te modelleren op meerdere ruimtelijke en temporele schalen
Sonu Khanal
Amsterdam 2021
Faculty of Science
Vrije University
Promotoren:
Prof.dr.ir. B.J.J.M. van den Hurk
Prof.dr. W.W. Immerzeel
Copromotor:
Dr. A.F. Lutz
Examination committee:
Prof.dr. J.C.J.H. Aerts
Vrije University, The Netherlands
Prof.dr. M.F.P. Bierkens
Utrecht Univerity, The Netherlands
Prof.dr. F. Ludwig
Wageningen University, The Netherlands
Dr. A.B. Shrestha
International Centre for Integrated Mountain Development, Nepal
Prof.dr. L.M. Tallaksen
University of Oslo, Norway
ISBN 978-94-6423-568-5
Published by Faculty of Science, Vrije University, the Netherlands
Printed by ProefschriftMaken || proefschriftmaken.nl
Correspondence to Sonu Khanal, [email protected]/[email protected]
Typesetting: Rene Wijngaard, Sonu Khanal, Martijn de Klerk and proefschriftmaken.nl
Cover image painted by Kriti Shrestha
Copyright © 2021 by Sonu Khanal
Compound drivers of hydroclimatic extremes in large river basins © 2021 by Sonu Khanal is
licensed under Attribution-NonCommercial-NoDerivatives 4.0 International. To view a copy
of this license, visit http://creativecommons.org/licenses/by-nc-nd/4.0/
Chapters 2 to 5 and appendices are either unpublished submitted article or based on the final
author versions of previously published articles, © by Sonu Khanal and co-authors. More
information and citation suggestion are provided at the beginning of these chapters.
v
Contents
SUMMARY ....................................................................................................................................................... 1 SAMENVATTING ............................................................................................................................................... 5 1 INTRODUCTION ....................................................................................................................................... 9
1.1 BACKGROUND: EXTREME EVENTS ...................................................................................................................... 9 1.2 MODELING FRAMEWORK ............................................................................................................................... 10
1.2.1 Statistical approach ....................................................................................................................... 10 1.2.2 Physical modeling .......................................................................................................................... 12
1.3 COMPOUND EVENTS ..................................................................................................................................... 18 1.3.1 Definition ....................................................................................................................................... 18 1.3.2 Typology of compound events ....................................................................................................... 19 1.3.3 Compound event and risk analysis framework.............................................................................. 20 1.3.4 Compound event under climate change ........................................................................................ 22
1.4 RESEARCH OBJECTIVES AND THESIS OUTLINE ...................................................................................................... 23 2 HISTORICAL CLIMATE TRENDS OVER HIGH MOUNTAIN ASIA DERIVED FROM ERA5 REANALYSIS DATA 27
2.1 INTRODUCTION............................................................................................................................................ 27 2.2 STUDY AREA ............................................................................................................................................... 29 2.3 DATA AND METHODS ................................................................................................................................... 29 2.4 RESULTS ..................................................................................................................................................... 32
2.4.1 Climatic characteristics ................................................................................................................. 32 2.4.2 Trends in temperature and temperature-derived indices ............................................................. 33 2.4.3 Trends in precipitation and precipitation-derived indices ............................................................. 35 2.4.4 Trends in compounding extremes of temperature and precipitation ............................................ 40
2.5 DISCUSSION ................................................................................................................................................ 42 2.5.1 Regional patterns in ERA5 and comparison to previous findings .................................................. 42 2.5.2 Implications for extreme events and hazards................................................................................ 45 2.5.3 Uncertainties, limitations, and outlook ......................................................................................... 46
2.6 CONCLUSIONS ............................................................................................................................................. 47 ACKNOWLEDGMENTS .................................................................................................................................... 47 3 VARIABLE 21ST CENTURY CLIMATE CHANGE RESPONSE FOR RIVERS IN HIGH MOUNTAIN ASIA AT SEASONAL TO DECADAL TIME SCALES ............................................................................................................ 49
3.1 INTRODUCTION............................................................................................................................................ 49 3.2 STUDY AREA ................................................................................................................................................ 50 3.3 DATA, AND METHODS .................................................................................................................................. 51
3.3.1 Glacio-hydrological model ............................................................................................................. 51 3.3.2 Data ............................................................................................................................................... 54 3.3.3 Methods ........................................................................................................................................ 56
SNOW COVER CALIBRATION ........................................................................................................................... 57 GLACIER MASS BALANCE CALIBRATION .......................................................................................................... 57 DISCHARGE CALIBRATION .............................................................................................................................. 57
3.4 RESULTS ..................................................................................................................................................... 58 3.4.1 Bias correction ............................................................................................................................... 58 3.4.2 Model calibration and validation .................................................................................................. 59 3.4.3 Hydrological regimes ..................................................................................................................... 61 3.4.4 Hydrological responses at different time scales ............................................................................ 64
3.5 DISCUSSION ................................................................................................................................................ 68 3.5.1 Climate change response at smaller spatial scales ....................................................................... 68 3.5.2 Hydrological regimes at smaller spatial scales .............................................................................. 69
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575859596264
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6666676972767677
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3.5.3 Comparison with other studies ...................................................................................................... 69 3.5.4 Uncertainties and limitations ........................................................................................................ 71
3.6 CONCLUSIONS ............................................................................................................................................. 72 ACKNOWLEDGMENTS .................................................................................................................................... 72 4 THE IMPACT OF METEOROLOGICAL AND HYDROLOGICAL MEMORY ON COMPOUND PEAK FLOWS IN THE RHINE RIVER BASIN ........................................................................................................................................ 73
4.1 INTRODUCTION............................................................................................................................................ 73 4.2 STUDY AREA ............................................................................................................................................... 75 4.3 DATA, MODEL AND METHODS ....................................................................................................................... 75
4.3.1 Data ............................................................................................................................................... 75 4.3.2 Hydrological Model ....................................................................................................................... 75 4.3.3 Snow Memory Effects .................................................................................................................... 77 4.3.4 Soil Moisture Memory Effects ....................................................................................................... 77 4.3.5 Meteorological Autocorrelation .................................................................................................... 77
4.4 RESULTS AND DISCUSSION ............................................................................................................................. 78 4.4.1 Performance of the Hydrological Model ....................................................................................... 78 4.4.2 Snow Memory Effects .................................................................................................................... 80 4.4.3 Soil Moisture Memory Effects ....................................................................................................... 80 4.4.4 Meteorological Autocorrelation .................................................................................................... 82
4.5 DISCUSSION AND CONCLUSIONS ..................................................................................................................... 85 5 STORM SURGE AND EXTREME RIVER DISCHARGE: A COMPOUND EVENT ANALYSIS USING ENSEMBLE IMPACT MODELLING ...................................................................................................................................... 89
5.1 INTRODUCTION............................................................................................................................................ 89 5.2 DATA AND METHODS .................................................................................................................................... 91
5.2.1 Study area ..................................................................................................................................... 91 5.2.2 Observations and climate model data .......................................................................................... 92 5.2.3 Hydrological modeling of Rhine river discharge using SPHY and HBV-96 ..................................... 92 5.2.4 Storm surge modeling of the North Sea using WAQUA/DCSMv5 ................................................. 94
5.3 PERFORMANCE OF THE SURGE AND DISCHARGE MODELS ...................................................................................... 94 5.3.1 Hydrological models (SPHY and HBV) ............................................................................................ 94 5.3.2 Basic metrics and distribution ....................................................................................................... 95 5.3.3 Flood wave duration distribution .................................................................................................. 95 5.3.4 Timing of onset and peak .............................................................................................................. 97
5.4 DEPENDENCIES BETWEEN STORM SURGE AND RIVER DISCHARGE ............................................................................ 98 5.4.1 Dependence in the tail of the distributions ................................................................................. 100 5.4.2 Joint distribution .......................................................................................................................... 102 5.4.3 Compound probabilities .............................................................................................................. 104
5.5 DISCUSSION .............................................................................................................................................. 104 5.6 CONCLUSION AND RECOMMENDATION ........................................................................................................... 106
6 SYNTHESIS ........................................................................................................................................... 108 6.1 UNDER WHICH CONDITIONS ARE HYDROLOGICAL RISK ASSESSMENTS BASED ON MULTIVARIATE ANALYSIS METHODS ARE MORE REALISTIC THAN BASED ON UNIVARIATE METHODS? .................................................................................................... 108 6.2 WHAT IS THE BEST APPROACH TO COMBINE PROXY-BASED INDICATORS WITH PROCESS-BASED MODELING TO STUDY THE ROLE OF COMPOUND DRIVERS IN HYDROLOGICAL RISK ASSESSMENTS? ................................................................................... 109 6.3 CAN WE IMPROVE THE UNDERSTANDING AND PREDICTION OF HYDROLOGICAL EXTREMES IF MEMORY EFFECTS, AND COMPOUND DRIVERS ARE INCORPORATED? ............................................................................................................... 110 6.4 WHAT IS THE IMPACT OF USING ADVANCED MODELS AND ANALYSIS TECHNIQUES ON THE ASSESSMENT OF HYDRO-METEOROLOGICAL RISKS? ...................................................................................................................................... 111 6.5 RESEARCH NOVELTIES ................................................................................................................................. 111 6.6 RECOMMENDATIONS AND RESEARCH OUTLOOK ............................................................................................... 112
6.6.1 Improvement in understanding of the physical processes and its implementation in glacio-hydrological models ................................................................................................................................... 112
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vii
6.6.2 Improvement of atmospheric modeling and increase in efforts related to measurement of ground data 115 6.6.3 Integrated modeling approach .................................................................................................... 116 6.6.4 Climate change and compound events ....................................................................................... 116
APPENDIX A ................................................................................................................................................. 118 APPENDIX B .................................................................................................................................................. 128 APPENDIX C .................................................................................................................................................. 142 APPENDIX D ................................................................................................................................................. 146 BIBLIOGRAPHY ............................................................................................................................................. 150 ACKNOWLEDGEMENTS ................................................................................................................................ 183 ABOUT THE AUTHOR .................................................................................................................................... 185 LIST OF PEER-REVIEWED PUBLICATIONS ....................................................................................................... 187 FINANCIAL SUPPORT .................................................................................................................................... 189
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Summary
1
Summary
witnessed many changes in recent decades and has diverse effects on the region’s water availability.
Samenvatting
7
overstromingsrisico’s bij samengestelde extremen te leren begrijpen en de impact ervan o
Chapter 1
12
;. It is often referred to as “the curse of few observations”. A practical example 1.2 framework 1.2.1 1.2.1.1 tremes speeds. The UE’s may have tangible and direct ethical, social, economic and environmental impacts,
Introduction
13
analyse the UE’s statistically, there are mainly two methods. The first method relies on fitting ;;;; EVT provides a robust means of statistical modeling of UE’s thus making it suitable to use for hydro;; ; ; ; ;;;;1.2.1.2 ; ; ;;;; ;;;;
Chapter 1
18
;;;;1.2.2.4 Spatio;; ;;;; ;;1.2.2.5 ;;;;; ; 1.2.2.6; ;;;;;sometimes referred to as “model uncertainty”
Introduction
19
; ; ; ; ;;–1.2.2.7 Coupli models overall response of the system doesn’t provide key knowledge on how ; ;;;;;;;;;;;; ; ; ;;;;;
Chapter 1
20
;;1.3 events 1.3.1 Definition ; ; ;;;;;;2014; Dunn et al., 2020; Kokkonen et al., 2006; Kundzewicz et al., 2014; O’Gorman, 2015);;; ;;;;
Introduction
21
“(1) two or more extreme contributing events can be of similar (clustered multiple events) or different type(s).” ;’“a combination of multiple drivers and/or hazards that contributes to societal or environmental risk” 1.3.2
Chapter 1
24
; ; ; ;occurrence of flood in one river, or the other, or both hazard scenarios and both ‘OR’ and ‘AND’ hazard ; ;;e either ‘AND’ or ‘OR’, or both hazard scenarios are used. Multivariate hazard scenarios coula “Kendal”, “Survival Kendall” and “Structural” approach 1.3.4 ; ; ;
Historical climate trends
37
Sen’s slope estimate, and its ndall’s significance test ; Sen’s slope method involves calculating the slope its m 𝑄𝑄𝑄𝑄 = 𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖
′ − 𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖′ − 𝑖𝑖𝑖𝑖
(1)
𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖
′𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖′𝑖𝑖𝑖𝑖𝑖𝑖𝑖𝑖′ > 𝑖𝑖𝑖𝑖.𝑄𝑄𝑄𝑄
Chapter 2
38
2.4 Results 2.4.1 characteristics
BASIN Region Climate Mean
elevation (m asl)
Area (km2)
Upstream Area (%)
Mean precipitation
(mm yr-1)
Mean temperature
°C Brahmaputra Southern Monsoon 4003 400 75.7 1978 (-2.25) 1.7 (0.03) Ganges Southern Monsoon 3090 202 17.8 1755 (5.03) 6.8 (0.03) Irrawaddy Southern Monsoon 2109 49 12.6 3593 (-24.73) 12.9 (0.02) Mekong Eastern Monsoon 3968 111 13.7 1035 (-1.37) 0.8 (0.03) Salween Eastern Monsoon 4430 119 44.4 1096 (-2.31) -2.1 (0.04) Yangtze Eastern Monsoon 3678 687 38.5 1108 (-0.13) 1.9 (0.03) Yellow
Eastern Monsoon 3389 273 31.8 740 (-0.06) 0.5 (0.04) Amu Darya Western Westerly 2930 268 33.6 678 (-1.29) 0.8 (0.03) Balkash Western Westerly 2144 121 27.2 877 (-0.28) 1.2 (0.02) Helmand Western Westerly 2355 74 29.7 367 (-2.11) 9.8 (0.05) Indus Western Westerly 3511 473 42.4 837 (-1.98) 0.6 (0.04) Syr Darya Western Westerly 2331 173 15.5 941 (1.10) 2.5 (0.03) Alaguy Northern Westerly 1506 75 51.8 218 (-0.47) 6.8 (0.03) Pai-t'a Ho Northern Westerly 2664 16 14.4 633 (-1.07) 0.6 (0.05) Jo-Shui Northern
Northern
rth
Westerly 2575 66 18.8 395 (0.57) 1.3 (0.05) Junggar Northern Westerly 1778 152 44.9 387 (-0.18) 3.0 (0.02) Plateau of Tibet Interior
Interior mixed 4996 415 100 444 (3.57) -3.2 (0.03) Tarim Interior East Interior mixed 3842 600 37.8 305 (1.63) -2.4 (0.04) Tarim Interior West Interior mixed 3301 481 30.3 371 (0.14) -0.9 (0.03)
Historical climate trends
53
;;2.6 Conclusions
Acknowledgments s also partly funded by the European Union’s and Innovation Program under the Marie Skłodowska
Chapter 3Variable 21st century climate change response for rivers in High Mountain
Asia at seasonal to decadal time scales
Chapter 3
58
; ;;;;;;;; ;;;;; ;;;; 3.2 We define HMA as the region within 57°−113° E and 22°− 47° N encompassing the Tibetan Plateau
Chapter 3
60
–– –
(𝑄𝑄𝑄𝑄Tot)𝑄𝑄𝑄𝑄GM𝑄𝑄𝑄𝑄SM𝑄𝑄𝑄𝑄RR𝑄𝑄𝑄𝑄BF
𝑄𝑄𝑄𝑄𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇𝑇 = ∑(𝑄𝑄𝑄𝑄𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺 , 𝑄𝑄𝑄𝑄𝑆𝑆𝑆𝑆𝐺𝐺𝐺𝐺 , 𝑄𝑄𝑄𝑄𝑅𝑅𝑅𝑅𝑅𝑅𝑅𝑅 , 𝑄𝑄𝑄𝑄𝐵𝐵𝐵𝐵𝐵𝐵𝐵𝐵)
Climate change response on hydrology
61
3.3.1.1 ;; 𝐼𝐼𝐼𝐼 (𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆)𝐺𝐺𝐺𝐺𝐺𝐺𝐺𝐺
𝑰𝑰𝑰𝑰𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋 = 𝑺𝑺𝑺𝑺𝒏𝒏𝒏𝒏𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋 − 𝑮𝑮𝑮𝑮𝑮𝑮𝑮𝑮𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋
𝑆𝑆𝑆𝑆𝑗𝑗𝑗𝑗𝑉𝑉𝑉𝑉red
𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋 = 𝟎𝟎𝟎𝟎 , 𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝑩𝑩𝑩𝑩𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋
∑ 𝑰𝑰𝑰𝑰𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝑩𝑩𝑩𝑩𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋
×𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝒏𝒏𝒏𝒏𝑽𝑽𝑽𝑽𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋
∑ 𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝒏𝒏𝒏𝒏𝑽𝑽𝑽𝑽𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝑨𝑨𝑨𝑨𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋, 𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝒋𝑨𝑨𝑨𝑨𝒏𝒏𝒏𝒏,𝒋𝒋𝒋𝒋
𝑆𝑆𝑆𝑆𝑉𝑉𝑉𝑉ini
Chapter 3
62
3.3.1.2 ;𝑃𝑃𝑃𝑃sub
𝑷𝑷𝑷𝑷𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔 = 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 × (𝟏𝟏𝟏𝟏 − 𝒆𝒆𝒆𝒆) × 𝒉𝒉𝒉𝒉 𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑒𝑒𝑒𝑒–ℎ 𝑃𝑃𝑃𝑃sub –; 𝑆𝑆𝑆𝑆max) 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 = (𝟏𝟏𝟏𝟏 − 𝜶𝜶𝜶𝜶) × 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 × 𝑳𝑳𝑳𝑳 where, α is albedo (a unitless number varying from 0 to 1), and 𝐿𝐿𝐿𝐿 ;𝑆𝑆𝑆𝑆con
𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 = (𝑻𝑻𝑻𝑻 <= 𝟎𝟎𝟎𝟎) & (𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 > 𝟎𝟎𝟎𝟎) & (𝑷𝑷𝑷𝑷 <= 𝟏𝟏𝟏𝟏) 𝑇𝑇𝑇𝑇𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑃𝑃𝑃𝑃𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆𝑆act
𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 = 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 × 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 × 𝑷𝑷𝑷𝑷𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔𝒔 × 𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺𝑺 𝑆𝑆𝑆𝑆fact3.3.2 3.3.2.1 – 𝑇𝑇𝑇𝑇cor
Climate change response on hydrology
63
𝑻𝑻𝑻𝑻𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄𝒄,𝒕𝒕𝒕𝒕 = 𝑻𝑻𝑻𝑻𝒄𝒄𝒄𝒄𝒓𝒓𝒓𝒓𝒓𝒓𝒓𝒓,𝒕𝒕𝒕𝒕 × 𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝑽𝒎𝒎𝒎𝒎,𝒕𝒕𝒕𝒕 × (𝒉𝒉𝒉𝒉𝟏𝟏𝟏𝟏 − 𝒉𝒉𝒉𝒉𝟐𝟐𝟐𝟐)
𝑇𝑇𝑇𝑇cor,𝑡𝑡𝑡𝑡 𝑇𝑇𝑇𝑇res,𝑡𝑡𝑡𝑡 𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑉𝑡𝑡𝑡𝑡ℎ1ℎ2 ; ––; –;–– 3.3.2.2
Chapter 3
64
3.3.2.3 – 3.3.3 3.3.3.1 ;;;
Basin Names Station
period
Validation
period
Missing
Years
Frequency Type
–
Climate change response on hydrology
65
; 𝑇𝑇𝑇𝑇crit DDFs3.3.3.2
𝑆𝑆𝑆𝑆fact𝑆𝑆𝑆𝑆fact
; 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐 𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑑𝑑𝑑𝑑𝑐𝑐𝑐𝑐𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑑𝑑𝑑𝑑𝑐𝑐𝑐𝑐𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑑𝑑𝑑𝑑𝑐𝑐𝑐𝑐𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐
𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝒅𝒅𝒅𝒅𝒅𝒅𝒅𝒅 = 𝟎𝟎𝟎𝟎. 𝟐𝟐𝟐𝟐 × 𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝑫𝒅𝒅𝒅𝒅𝒄𝒄𝒄𝒄
𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝐷𝑐𝑐𝑐𝑐𝑐𝑐𝑐𝑐;;; −
Climate change response on hydrology
71
;;;; : –
Precipitation Area Glacier Runoff Runoff coef.
CV of runoff Glacier Snow Rainfall Base
Melt
Basin (mm yr-1) (Km2) area (%) (mm yr-1) - (%) melt melt runoff flow (%)
Amu Darya (AMU) 676 268,280 4.36 407 0.60 89 4.4 74.4 5.4 15.8 78.8 Brahmaputra (BRA) 2018 400,182 2.73 1575 0.78 85 1.8 13.2 62.1 22.8 15.0 Ganges (GAN) 1763 202,420 4.37 1293 0.73 101 3.1 10.3 64.7 22.0 13.4 Helmand (HEL) 360 74,334 0.00 195 0.54 140 0.0 77.5 5.2 17.4 77.5 Indus Basin (IND) 832 473,494 6.28 577 0.70 83 5.1 39.7 43.9 11.4 44.7 Irrawaddy (IRR) 3638 49,029 0.15 3223 0.88 87 0.0 5.1 78.2 16.7 5.1 Lake Balkash (BAL) 856 121,185 3.39 543 0.62 43 2.2 46.3 9.3 42.3 48.5 Mekong (MEK) 1066 110,678 0.26 528 0.49 101 0.3 7.4 55.1 37.2 7.7 Plateau of Tibet Interior (TP) 451 415,197 0.83 117 0.25 162 2.3 15.3 32.8 49.6 17.6 Salween (SAL) 1091 119,377 1.45 627 0.57 94 1.4 14.7 55.7 28.3 16.1 Syr Darya (SYR) 942 172,704 1.70 456 0.48 97 1.3 72.9 5.6 20.2 74.2 Tarim Interior East (TIE) 305 600,182 0.90 126 0.42 93 1.1 20.2 49.7 29.0 21.3 Tarim Interior West (TIW) 373 481,481 5.77 166 0.45 103 5.8 28.4 44.4 21.4 34.2 Yangtze (YAN) 1127 687,150 0.39 849 0.75 76 0.2 5.5 71.0 23.3 5.7 Yellow (YEL) 751 272,857 0.05 468 0.62 77 0.1 9.6 63.9 26.5 9.6
Climate change response on hydrology
75
–
WARM WET COLD WET WARM DRY COLD DRYAMU GAN IND BAL TIW BRA MEK TP SAL TIE YEL HEL SYR IRR YAN
3.4.4.2
Chapter 3
80
3.6 Conclusions
Acknowledgments Horizon 2020 Research and Innovation Program under the Marie Skłodowska‐Curie grant RC) under the European Union’s Horizon 2020
Chapter 4The Impact of Meteorological and
Hydrological Memory on Compound Peak Flows in the Rhine River Basin
Impact of memory on peak flows
85
4
– ; ; ; ; ; 4.1 ;;; ;longer time scales “remember” past atmospheric anomalies and their effects are reflected in subsequent ; ; ;;; —or ‘Hurst phenomenon’— ; ; ; ;;;;
Chapter 4
86
; ; ; ; ; ; ; ; ;;; ; ;;;;; ;per analysis for such CE’s requires a consistent long spatialtask to analyze the CE’s f ;; ;;
Impact of memory on peak flows
87
4.2 rea ;; “design discharge” of 16,000 4.3 4.3.1 Data–were adjusted to local topography using a vertical lapse rate of −6.4.3.2 based) “leakybucket” type model. The model –;
Impact of memory on peak flows
89
referred to as ‘routing model’). Therouting model is calibrated for the Manning’s n value using the 4.3.3 4.3.4 4.3.5 ;
Chapter 4
90
The resampling technique used in the study. ‘d’ stands for the calendar day, ‘y’ stand for the year and ‘M’ stands for the ensemble member number. The color designates the sequenc–
4.4 4.4.1 4.4.1.1
Impact of memory on peak flows
97
;; consistent with the evolution of the region’s temperature ( 4.5 ;; ; ; ;;;
Impact of memory on peak flows
99
;;;;;;; ; ; ; ; ;—;—
was funded by the European Union’sion’s Horizon
Chapter 5Storm surge and extreme river discharge:
a compound event analysis using ensemble impact modelling
Chapter 5
106
5.2.2 ; – 5.2.3 e 96 uted, physically based “leakybucket” type model, which operates on a gridpoint basis. It integrates parameterizations of the dominant –; ;
Strom surge and extreme river discharge
107
calibrated for Manning’s n for the same time period as SPHY. The daily flux in mm/day generated by
Strom surge and extreme river discharge
109
5.3.2 and a forecast model for the Rhine river’s discharge extremes without additional
antiles: “Low” “Medium” (5–95%, green), and “High” (>95%). The solid red line represents the 1:1 slope.
5.3.3
Chapter 5
116
– – 5.4.2 physically related ensemble is compared to a “randomized version” where the statistical relation
Strom surge and extreme river discharge
117
correspond to the highest TWL (∆), discharge (+) and compound events (o) for individual ensemble
Strom surge and extreme river discharge
119
k succession (“twin storms”) where the second storm coincides wis explained by “twin storms” ; ;
Strom surge and extreme river discharge
121
Com
funding from the European Union’s Horizon 2020 research and inprogramme under the Marie Skłodowskaect “Impacted by Coincident Weather Extremes” (ICOWEX; grand n
Chapter 6
128
6.4?
;;;. Inclusion of sublimation process in the simulation of HMA’s hydrology significantly ;; ;; SPHY is coupled with a kinematic wave routing scheme and calibrated based on the Manning’s n
6.5
•
Chapter 6
132
libration parameter i.e., ‘kx’) implemented within the PCRaster modelling ;; . The method uses calibration of Manning’s n ;; 6.6.2
; ; ; ;;;;; ;;;; ;;; ; ; ;;;; ;
Conclusion
133
;;;6.6.3 ;;;; ;;;;;; ;; ;; ; 6.6.4 C s‘topdown approach’ to a ‘bottomup approach’. The traditional top
Appendix A
137
Appendix A
–
0.029 0.054 0.022 0.020 0.029 0.038 0.031 0.019 0.03 0.018 0.022 0.021 0.034 0.063 0.03 0.035 0.052 0.023 0.030 0.033 0.042 0.021 0.037 0.042 0.025 0.046 0.053 0.037 0.029 0.042 0.038 0.022 0.055 0.027 0.053 0.063 0.073 0.043 0.027 0.036 0.034 0.046 0.033 0.052 0.026 0.058 0.028 0.027 0.054 0.039 0.049 0.073 0.056 0.034 0.046 0.068 0.054 0.035 0.020 0.059 0.035 0.033 0.053) 0.024 0.018 0.039 0.030 0.045 0.046 0.026 0.034 0.052 0.037 0.037
Appendix A
138
–
0.142 0.054 0.004 0.006 0.057 0.018 0.000 0.000 0.046 0.062 0.165 0.048 0.028 0.007 0.240 0.075 0.031 0.051 0.194 0.078 0.001 0.108 0.018 0.021 0.439 0.207 0.018 0.223 0.028 0.034 0.119 0.035 0.020 0.235 0.197 0.031 0.000 0.054 0.129 0.006 0.001 0.133 0.014 0.028 0.004 0.142 0.043 0.007
Appendix A
139
–
0.891 5.018 5.495 24.725 2.85 13.746 3.858 0.334 0.610 2.13 3.565 3.196 1.625 1.447 0.121
Appendix A
140
–
0.028 0.146 0.176 0.591 0.113 0.25 0.091 0.1 0.144 0.014 0.097 0.09 0.094 0.073 0.054 0.05 0.063 0.056 0.04 0 0.038
Appendix A
142
–
2.505 0.163 0.025 0.085 0.355 0.032 0.015 0.118 0.064 0 0 1.209 0.129 0 0.143 0.009
Appendix B
147
Appendix B
1
2
;
𝜎𝜎𝜎𝜎𝐹𝐹𝐹𝐹2 = ∑ [𝑑𝑑𝑑𝑑𝑑𝑑𝑑𝑑 (𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖 … . 𝑥𝑥𝑥𝑥𝑛𝑛𝑛𝑛)
𝑑𝑑𝑑𝑑𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖]
2𝜎𝜎𝜎𝜎𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖
2𝑛𝑛𝑛𝑛
𝑖𝑖𝑖𝑖=1
(B1)
𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖𝜎𝜎𝜎𝜎𝑥𝑥𝑥𝑥𝑖𝑖𝑖𝑖2
; –;;;–;
148
Calib
rate
d va
lue
YEL 4.5 0 0.5 1 3 0.6
0.00
0
0.7 50
0.93
3
75
0.7
0.94
5
YAN 4.5 0 0.5 1 4.
11
0.82
-0.0
02
0.7 50
0.93
3
75
0.7
0.94
5
TIW
4.5 0 0.5 1 5.
19
1.04
0.00
0
0.7 50
0.93
3
1 0.7
0.94
5
TIE 4.
5 0 0.5
0.5
4.26
0.85
-0.0
01
1 50
0.93
3
75
0.7
0.94
5
SYR 4.5 0 0.5 1 3.
45
0.69
-0.0
01
1 500
0.93
3
1 1.3
0.94
5
SAL 4.5 0 0.5 1 3.
07
0.61
-0.0
04
1 50
0.93
3
1 1.3
0.94
5
TP 4.5 0 0.5
0.3
3.51
0.7
-0.0
02
0.7
100
0.93
3
1 1.3
0.94
5
MEK
4.5 0 0.5 1 3.
92
0.78
-0.0
02
1.3 50
0.93
3
1 0.7
0.94
5
BAL 4.5 0 0.5 0 4.
08
0.82
-0.0
02
1 500
0.93
3
150
0.7
0.94
5
IRR 4.
5 0 0.5 0 4.
03
0.81
-0.0
01
1 50
0.93
3
1 1.3
0.94
5
IND 4.
5 0 0.5 1 4.
26
0.85
-0.0
01
0.7 50
0.93
3
1 0.7
0.94
5
HEL 4.5 0 0.5 1 - - - 1 500
0.93
3
150
0.7
0.94
5
GAN 4.5 0 0.5 1 3.
57
0.71
-0.0
01
1.3 50
0.93
3
150
1.3
0.94
5
BRA 4.5 0 0.5
0.9
4.25
0.85
-0.0
01
0.7
100
0.93
3
1 1.3
0.94
5
AMU
4.5 0 0.5 1 4.
17
0.83
0.00
0
1 500
0.93
3
150
0.7
0.94
5
Units
mm
°C-1
da
y-1
°C
mm
mm
-1
-
mm
°C-1
da
y-1
mm
°C-1
da
y-1
°C m
−1
- mm
-
days
- -
Desc
riptio
n
Degr
ee d
ay fa
ctor
for s
now
Criti
cal t
empe
ratu
re
Wat
er st
orag
e ca
pacit
y of
sn
ow p
ack
Subl
imat
ion
fact
or
Degr
ee d
ay fa
ctor
for
debr
is fre
e gl
acie
rs
Degr
ee d
ay fa
ctor
for
debr
is co
vere
d gl
acie
rs
Vert
ical l
apse
rate
co
rrec
tion
fact
or
Soil
mul
tiplic
atio
n fa
ctor
Dept
h of
top
root
laye
r zo
ne
Base
flow
rece
ssio
n co
effic
ient
Grou
ndw
ater
rech
arge
de
lay
time
Crop
coef
ficie
nt
mul
tiplic
atio
n fa
ctor
Rout
ing
rece
ssio
n co
effic
ient
Para
met
er
DDFs
Tcrit
Snow
SC
Sfac
t
DDFc
i*
DDFd
c*
Tlap
Cor*
Soilf
acto
r
Root
dept
h
αGW
δGW
Kc_m
ul
Kx
Appendix B
149149149
–
Basin location reference Period
P (m
m)
Snow
(%)
P (m
onso
on) (
%)
P (w
inte
r) (%
)
Flow
(mm
)
Flow
(mon
soon
) (%
)
Flow
(win
ter)
(%)
Base
flow
(%)
Snow
mel
t (%
)
Glac
ier f
low
(%)
Rain
flow
(%)
ET (%
)
Sub
(%)
Mon
soon
(s
now
flow
%)
Mon
soon
(g
lacie
r flo
w %
)
AMU 676 45.1 20.9 21.2 407 40.3 6.9 15.8 74.4 4.4 5.4 30.3 8.9 69.8 10.5 BRA 2018 8.8 60.0 9.8 1575 66.4 6.9 22.8 13.2 1.8 62.1 19.3 2.5 7.7 2.5 GAN 1763 9.5 71.2 7.3 1293 73.8 9.6 22.0 10.3 3.1 64.7 23.2 2.9 6.4 3.9 HEL 360 30.1 4.0 18.5 195 6.3 5.2 17.4 77.5 0.0 5.2 43.7 2.2 2.7 0.0 IND 832 34.6 40.3 13.0 577 60.1 5.3 11.4 39.7 5.1 43.9 19.7 10.0 35.2 8.3 IRR 3638 2.4 61.9 10.2 3223 67.3 8.3 16.7 5.1 0.0 78.2 11.4 0.0 2.2 0.0 BAL 856 23.7 51.0 16.1 543 40.0 16.9 42.3 46.3 2.2 9.3 35.6 0.0 35.6 5.3 MEK 1066 8.8 66.2 11.0 528 75.7 8.3 37.2 7.4 0.3 55.1 43.8 6.7 1.0 0.3 TP 451 12.0 79.6 5.4 117 88.7 2.7 49.6 15.3 2.3 32.8 65.1 9.0 5.8 2.6 SAL 1091 15.2 62.7 11.3 627 71.5 7.1 28.3 14.7 1.4 55.7 32.7 10.1 5.2 1.8 SYR 942 28.7 38.3 18.9 456 30.3 7.9 20.2 72.9 1.3 5.6 49.1 2.1 55.9 4.2 TIE 305 24.2 67.9 7.3 126 72.3 11.2 29.0 20.2 1.1 49.7 40.5 17.7 11.7 1.5 TIW 373 31.4 61.3 9.3 166 73.5 3.1 21.4 28.4 5.8 44.4 35.0 17.3 15.1 7.5 YAN 1127 7.4 63.8 12.4 849 65.2 15.3 23.3 5.5 0.2 71.0 20.1 4.6 0.7 0.3 YEL 751 11.0 64.6 11.5 468 64.9 16.1 26.5 9.6 0.1 63.9 31.2 6.5 1.4 0.1
Appendix D
166
ed on observed percentiles: “low” (<5%, red), “med” (5–95%, green) and “high” (>95%, blue).
Appendix D
168
colored points correspond to the highest TWL (∆), discharge (+) and compound events (o) for individual
𝑁𝑁𝑁𝑁𝑆𝑆𝑆𝑆𝐸𝐸𝐸𝐸 = 1 − ∑ (𝑄𝑄𝑄𝑄𝑚𝑚𝑚𝑚
𝑡𝑡𝑡𝑡 − 𝑄𝑄𝑄𝑄𝑜𝑜𝑜𝑜𝑡𝑡𝑡𝑡 )2𝑇𝑇𝑇𝑇
𝑡𝑡𝑡𝑡=1∑ (𝑄𝑄𝑄𝑄𝑜𝑜𝑜𝑜
𝑡𝑡𝑡𝑡 − 𝑄𝑄𝑄𝑜𝑜𝑜𝑜)2𝑇𝑇𝑇𝑇𝑡𝑡𝑡𝑡=1
(D)
;𝑄𝑄𝑄𝑜𝑜𝑜𝑜𝑄𝑄𝑄𝑄𝑚𝑚𝑚𝑚𝑄𝑄𝑄𝑄𝑜𝑜𝑜𝑜
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About the author
205
bachelor’s degree in Civil Engimaster’s in Water Resources During his master’s PhD was funded by Marie Skłodowska for “”