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© 2012 by DB Sediments
Continuous Sediment Transfer
ConSedTrans - Method A way to reduce the risk of sedimentation and siltation, flooding,
soil and coast erosion, and saltation of groundwater.
ACWUA’s 5th Best Practices Conference Utilities Perspective on Water Resources Management in the Arab Region
3-5 June, 2012, Muscat, Sultanate of Oman Dr. Dietrich Bartelt, DB Sediments GmbH, Germany
Reiner Bundesmann, DB Sediments GmbH, Germany
Imran Sevis, Fichtner Water & Transportation GmbH, Essen, Germany
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012 2
Causes sedimentation and siltation
The Use of Water – an Impact to the Eco-system
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012 3
The Two Sides of Sediment
1. Upstream: Sediment Surplus
2. Downstream: Sediment Deficit
© 2012 by DB Sediments 4
The Two Sides of Sediment Within the Reservoir: Sediment Surplus
Sediment accumulation in reservoirs leads to:
reduced flood protection
reduced storage capacity for hydro power peaking/seasonal storage
reduced storage for irrigation / drinking water supply
reduced biodiversity inside the reservoir (and i.e. higher temperatures, less oxygen)
WCD / ICOLD state that sedimentation in reservoirs exceeds the actual new build of reservoirs.
Every year almost 1 % of worldwide storage volume is lost.
20 % of all reservoirs will be inoperable by 2050.
sediment management is an urgent issue
ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
© 2012 by DB Sediments
Increasing Loss of Global Water Storage Capacity
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Net Storage Capacity Storage Capacity Lost Capacity (Sedimentation/Siltation)
Glo
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ap
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[B
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n m
³]
Source: Based on data from Jenzer and Cesare (2005) and GWSP Digital Water Atlas (2008)
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012 6
The Two Sides of Sediment
1. Upstream: Sediment Surplus
2. Downstream: Sediment Deficit
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012 7
The Two Sides of Sediment
Downstream: Sediment Deficit
Replacement of missing sediment is costly (e.g. Colorado, Rhine)
Missing sediment/changed morphology downstream of reservoirs cause:
... riverbed and bank erosion
... foundation failure of civil hydro structures
… agricultural substrate deficit
… change of aquatic ecosystem
… re-infiltration of saltwater into groundwater at river delta/coastline
… coastline erosion
© 2012 by DB Sediments 8
A river is an Eco-system
Sediments are an integral part of that system
Source: Global Water System Project www.gwsp.org
ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
Source: Google Maps (2011)
Sediment Deficit – Coast Erosion (e.g. Egypt,…)
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012 10
Present solution attempts cause negative effects.
1. Reservoir flushing by opening the base outlet
applicable when sedimentation reaches the dam
effective only for area near to outlet
loss of tremendous amounts of water and power production
strong negative ecological effects downstream
2. Manual dredging
usually plant offline for some months
enormous dump cost
reservoirs benthos structure destroyed
further erosion downstream
3. Dredging campaign with disposal downstream
requires large amounts of propulsion water
destroys benthos structure up- and downstream
short term sediment surplus downstream
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
System Sensitive Solution of DB Sediments®
Specially equipped hydraulic tools in very different sizes and dimensions
dredge the sediment from areas where the flow rate is too slow for natural
sediment transport, pump it through a piping system and deposit it into areas
where the flow rate is known and big enough for a quasi-natural transport of
sediments into the downstream area of the river.
© 2012 by DB Sediments 12
automated vessel size 1
Suitable equipment – System Sensitive Solution
manual small dredge vessel Larger/other/additional and
customized equipment
upon request:
- electric or diesel driven
- dredging depth up to 150 m
- unlimited capacity and/or sediment transfer range
dredge vessel size 2
- diesel driven - depth up to 15 m
- electric driven - depth up to 8 m
ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
- electric driven - depth up to 40 m
© 2012 by DB Sediments 13
The Research Project with RWTH Aachen
ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
RWE Innogy GmbH Sediment Management in Olsberg
14
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
RWE Innogy GmbH Sediment Management in Olsberg
Operator of the Hydro Power Plant: RWE Innogy GmbH
Olsberger Reservoir
River Ruhr / Sauerland
Silted reservoir for hydro power generation
Begin of Sediment
Management - continuous
sediment transfer on
December 1st, 2011
Transfered sediment:
about 200 t/month
15
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
Risk Analysis of Existing and Projected Dams
Assessment of the initial, original storage volume
- by processing of the original layout of the reservoir
Determination of existing, operational volume
- the lost, silted or sedimented volume of the reservoir,
- the siltation and sedimentation rate of the dam, and
- the estimation of the probable dam life,
under consideration of the necessary operational
range of the reservoir.
Furthermore, an analysis will comprise further risks
- possible consequences, like the blockage of the
bottom outlet of the dams by sliding sediments and
- risk of flooding caused by the reduction of the
retention volume of the reservoir.
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© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
Award of Excellence
Leading Global Sustainable Technology
17
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
The new process spends multiple benefit.
• Positive environmental effects:
• The process restores natural river morphology.
• It is environmentally and fish friendly.
• Keep quality and level of groundwater.
• Biodiversity in the river and in the coastal areas of the oceans.
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
The new process spends multiple benefit.
• Positive operational and economical effects:
• the reservoir can be used completely again.
• avoid enormous dump costs and/or
• avoid generation losses.
• Reduction of flood risk
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
Final Remarks
• Dramatic developing decrease of global storage capacity for water
• The River is an Ecosystem
• Sediments are an important part of the system
• There is an urgent need for sediment management in rivers and reservoirs
• The impact of using water can be compensated by continuous sediment transport – DB Sediments can provide a system sensitive solution
• There is no economic solution without an ecological solution
© 2012 by DB Sediments
“If you cut the transport of sediment in a river – you kill life in the river, as well as in the delta area
of the river in the ocean”.
Juan Pablo Orrega Silva, Alternative Nobel Prize Winner, Bonn, Germany, 15.11.2011
DB Sediments GmbH
Bismarckstr. 142
D-47057 Duisburg, Germany
T. +49-203-306-3620
F. +49-203-306-3629
[email protected] www.db-sediments.com
© 2012 by DB Sediments
BACKUP
© 2012 by DB Sediments ACWUA’s 5th Best Practices Conference, Oman 04.06.2012
Presentations in 2011/2012
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