Promoting Integrated Sediment Management

Newsletter 2 June 2012

The Project PRISMA aims to develop improved techniques to stimulate sediment reuse instead of landfill, by additional research and field work. The PRISMA pilot sites will demonstrate ... more sustainable removal methods improved decision making thanks to on-site quality analysis

good practice guidance in reuse method selection policy recommendations to promote reuse opportunities This cross-border cooperation (Two Seas Programme) will share this knowledge across Europe. The Partners The PRISMA project unites Waterwegen en Zeekanaal NV (Flanders), the Broads Authority (UK), Hoogheemraadschap voor Schieland en de Krimpenerwaard (the Netherlands), research association Armines, acting through Center of Douai—DGCE (France).

Construction work stopped at the end of May. All 250 baskets have been installed making the perimeter of the whole island. Further infilling work will then be fin-ished next winter. This photo shows the situation at the end of June, where the perimeter has been finished.

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Shape of Lost peninsula visible again One of the Broads Authority’s key PRISMA projects focuses on the dredging of an area called Heigham Sound and the use of sedi-ment to restore a lost peninsula eroded by tides and grazing geese. A pilot scheme last year successfully tested sediment-filled ga-bion baskets as a retaining wall. The same method will extend the 20m x 20m ‘island’ to measure 300m by 40m across the west-ern entrance of the broad. About 70 gabion baskets have been installed to form the first of three cells and once com-pleted the centre void will be filled in with dredged sediment from Heigham Sound, enabling the Authority to deepen the naviga-tion channel in the process. The restored reed bed will provide shelter and habitat for over-wintering birds.

Photo is courtesy of Mike Page

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B Businesscase Innovative sediment reuse in the Netherlands

Phase one is the removal of dispersible sediment in Gouda and Zuidplas

Phase two is the removal of the nondispersible sediment in Zuidplas

Phase three is currently under research The dredged materials are processed in geotex-tiles. With geotextiles it becomes possible to process more sediment near the site. Also, the volume of the sediment will be reduced by dewa-tering the sediment. As a result, the costs of dredging are reduced (less volume and less transportation).

Activities performed January – March 2012 The project started in December 2011 with the dispersible sediment in Gouda. Due to bad weather conditions the Ringvaart was frozen at the end January 2012 and dredging was not pos-sible. The activities were delayed by almost 3 weeks. During these months approximately 3.500 meters were dredged and 25.500 m3 were proc-essed into geotextiles. Also, this last period the Ringvaart located in the municipality of Zuidplas was prepared for dredging. Amongst others we researched the current quality of the soil on the parcels which will receive the dispersable sedi-ment after it is dewatered in geotextiles. On 1st of April the dredging of the Ringvaart in the munici-pality of Zuidplas starts.

Dredging the Ringvaart Water Board Schieland and Krimpenerwaard (HHSK) manages the area in the Southwest of the Netherlands that stretches between Rotterdam, Zoetermeer and Schoonhoven. The Ringvaart runs through both rural and urban areas between Rotterdam and Gouda and has a total distance of approximately thirty five kilometres and a width that varies between 5 and 30 meters. The Ringvaart plays an important role in local wa-ter transportation. The Ringvaart serves as an intermediate storage area (‘boezem’) where water from the river Hollandsche IJssel is supplied to the surrounding polders via inlets. Excess water in these surrounding polders is transferred to the river Hollandse IJssel via a pumping station. In addition, the Ringvaart also has a recreational function: the water is used as a waterway for rec-reational boating, professional and amateur fish-ing, and has a great value as a natural and land-scape element. The PRISMA project entails the part of the Ringvaart located in municipality of Zuidplas. The PRISMA lessons learned and solutions, will be taken into account and when possible applied to the dredging of the Ringvaart and other HHSK dredging projects. The project will be imple-mented in three phases:

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I Interview Nor-Edine Abriak Ecoles des Mines de Douai

Mr Nor-Edine Abriak is Director of soil Me-chanic Laboratory at the Civil and Environ-mental Engineering Department of Ecole des Mines de Douai and associate professor at the university of Sherbrook. Mr. Abriak, do you have a lot of experience in sediment management? After graduating as Engineer from ENSAIT Rou-baix, I obtained my doctorate in mechanics at the University of Science and technology in Lille. Shortly after this, I was appointed Director of re-search thanks to my thesis on the statics and dy-namics of granular mate- rials. Do you focus your research on the physical character of sediments? No, Ecole des Mines de Douai (EMD) has pur-sued several years of fundamental and applied research in the field of interaction between civil engineering materials and the environment. We also study the environmental character of sedi-ment, and the possible consequences of polluted sediment on site, in deposit or in reuse projects. What are the main results of your research? The research conclusions led to the "Regional Technical Guidelines on the use of waste and industrial by-products" as part of the Working

Group No. 5 PREDIS Nord - Pas de Calais. This

working group also completed an initial study for the Department on the development of marine sediments from the ports of Dunkerque and Grav-elines in road application. Is your work only know in France? No, the Civil and Environmental Engineering de-partment has become an important actor on the national and international projects including the Interreg program (PRISMA, SETARMS, GeDSeT). Research conducted within this framework is in-tended to meet industrial demand and may affect

Prisma project objectives were presented and widely discussed at the “International Symposium on Sediment Management: India 2012" organized by Indian partners and myself. What is your contribution to PRISMA? As part of the PRISMA project, EMD will study the regulations governing the management of river sediments in partner countries. Through these common data, processing pathways and valoriza-tion can be optimized and adapted to the needs of communities and regional and national indus-try. The project GeDSeT INTERREG IV (2008-2012) aims to develop a decision making tool for sediment management dredging methods. This tool will be built using the results of research and data collection in close collaboration with manag-ers of watercourses. And if possible also with PRISMA partners. What is the relation between GeDSeT and PRISMA? Well, recently we discussed this issue. The water-managers involved in PRISMA are very interested in the decision tool, while in GeDSeT the calibra-tion of the tool can only being elaborated better when using as much as possible data of different kinds of sediment. Initially feedback from actors and experts in the sediment management of Wal-lonia and France should optimize the decision tool. Opportunities and constraints of manage-ment on both sides of the border were analyzed, multi-criteria analysis of sediment management scenarios is being developed from the conse-quences and effects of technical choices in terms of sustainable development issues. Thus, four environmental criteria and two societal criteria specific to the field of managing sediment have been identified which will be added to economic criteria and reliability of management options.

On the International Coordination Group meeting at May 30th, 2012 it was ef-fectively decided to try to effectuate a cooperation between GeDSeT and PRISMA concerning the decision model. On Thursday the 31st May 2012 the delegates of the PRISMA partners visit ‘Duck Island’ and saw the perimeter of the lost peninsula completed.

Third partner meeting at May 30 & 31, 2012

At the office of the Broads Authority in Norwich the third International Co-ordination Group meeting of PRISMA is held.

For further information please contact www.prisma-projects.eu or contact:

Waterwegen en Zeekanaal NV Ms. Els Serbruyns, Project Manager Phone: +32 (0)9 268 02 62 Mail: els.serbruyns@wenz.be Website: www.wenz.be

News & Events

Buck Consultants International Mr. Karel Vanroye, Project Coordinator Phone: +32 (0)2 709 77 50 Mail: karel.vanroye@bciglobal.com Website : www.bciglobal.com

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Fourth partner meeting scheduled for November 2012

In November 2012 the fourth partner meeting of PRISMA will take place at the office of the lead partner Wa-terwegen & Zeekanaal in Belgium. Adjacent to the meeting in November 2012 also a workshop will be held concerning the reuse of sediment.

The Prisma project presented at conference in India On March 23rd, Nor-Edine Abriak and Mahfoud Benzerzour of EMD have presented the Prisma project at the 3rd “International Conference of Sedi-ment Management“ in India.