The Use of Water an Impact to the Eco-system

Transcription

1 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

2 The Use of Water an Impact to the Eco-system Causes sedimentation and siltation ACWUA s 5th Best Practices Conference, Oman

3 The Two Sides of Sediment 1. Upstream: Sediment Surplus 2. Downstream: Sediment Deficit ACWUA s 5th Best Practices Conference, Oman

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 sediment management is an urgent issue ACWUA s 5th Best Practices Conference, Oman

5 Year Global Storage Capacity [Billion m³] Increasing Loss of Global Water Storage Capacity Net Storage Capacity Storage Capacity Lost Capacity (Sedimentation/Siltation) Source: Based on data from Jenzer and Cesare (2005) and GWSP Digital Water Atlas (2008)

6 The Two Sides of Sediment 1. Upstream: Sediment Surplus 2. Downstream: Sediment Deficit ACWUA s 5th Best Practices Conference, Oman

7 The Two Sides of Sediment Downstream: Sediment Deficit 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 Replacement of missing sediment is costly (e.g. Colorado, Rhine) ACWUA s 5th Best Practices Conference, Oman

8 A river is an Eco-system Sediments are an integral part of that system Source: Global Water System Project ACWUA s 5th Best Practices Conference, Oman

9 Sediment Deficit Coast Erosion (e.g. Egypt, ) ACWUA s 5th Best Practices Conference, Oman Source: Google Maps (2011)

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 ACWUA s 5th Best Practices Conference, Oman

11 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. ACWUA s 5th Best Practices Conference, Oman

12 Suitable equipment System Sensitive Solution automated vessel size 1 - electric driven - depth up to 40 m dredge vessel size 2 - diesel driven - depth up to 15 m manual small dredge vessel Larger/other/additional and customized equipment - electric driven upon request: - depth up to 8 m - electric or diesel driven - dredging depth up to 150 m - unlimited capacity and/or sediment transfer range ACWUA s 5th Best Practices Conference, Oman

13 The Research Project with RWTH Aachen ACWUA s 5th Best Practices Conference, Oman

14 RWE Innogy GmbH Sediment Management in Olsberg ACWUA s 5th Best Practices Conference, Oman

15 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 ACWUA s 5th Best Practices Conference, Oman

16 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. ACWUA s 5th Best Practices Conference, Oman

17 Award of Excellence Leading Global Sustainable Technology ACWUA s 5th Best Practices Conference, Oman

18 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. ACWUA s 5th Best Practices Conference, Oman

19 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 ACWUA s 5th Best Practices Conference, Oman

20 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 ACWUA s 5th Best Practices Conference, Oman

21 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, DB Sediments GmbH Bismarckstr. 142 D Duisburg, Germany T F info@db-sediments.com

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23 Presentations in 2011/2012 ACWUA s 5th Best Practices Conference, Oman