continuous sediment transfer consedtrans - method

© 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


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


Increasing Loss of Global Water Storage Capacity

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Net Storage Capacity Storage Capacity Lost Capacity (Sedimentation/Siltation)

Glo

ba

l Sto

rag

e C

ap

ac

ity

[B

illio

n m

³]

Source: Based on data from Jenzer and Cesare (2005) and GWSP Digital Water Atlas (2008)



1. Upstream: Sediment Surplus

2. Downstream: Sediment Deficit



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


A river is an Eco-system

Sediments are an integral part of that system

Source: Global Water System Project www.gwsp.org


© 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,…)


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


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.


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


- electric driven - depth up to 40 m


The Research Project with RWTH Aachen



RWE Innogy GmbH Sediment Management in Olsberg

14


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


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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Award of Excellence

Leading Global Sustainable Technology

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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.


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


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


“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

http://www.db-sediments.com/




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