Presentation on theme: "Delta’s on the move… How to respond to climate change? 2."— Presentation transcript:
Delta’s on the move… How to respond to climate change? 2
Global Air Temperature Change 1856-2001 Warmest Year 1998 2 nd Warmest Year 2001 8 Warmest Years Trend = 0.6 + 0.2 o C. (CRU, 2002)
Global Impacts Sea level rise will have significant impacts on low-lying coastal areas and small islands...
RIKZ-study; SimDelta = Morphological Simulation Model Conclusion: because of the dikes and the dams sediment input from the sea was stopped. Subsidence of the polders was accelerated by drainage of the reclamated land.
Comcoast project Perk polder (Province of Zealand) Comcoast project Perk polder (Province of Zealand)
The Hondsbossche sea wall along the Dutch coast. By breaking through the sea wall, part of the land behind it will flood with the tides. The silt caught up in the vegetation ensures that the land gradually increases in height in line with or even above sea level. Realised in 1997.
Hollandsch Diep Haringvliet VZM Maas Bo. Merwede Lek Oude Maas Nieuwe MaasNieuwe Waterweg 880 150 730 160 460750 310 1520 330 550 990 440 Dordtse Kil Nwe Merwede 770 Be. Merwede 620 1610 5 Westerschelde Grevelingen 100 Oosterschelde Veerse meer w:40 z:25 9 440 880 Average flows (m3/s) The average freshwater supply of Rhine and Meuse to the west part of the Netherlands is ca. 2350 m3/s, while the need for agriculture, industry and tapwater does not exceed 25 - 75 m3/s Most of the freshwater is used to rinse incoming salt water Ies de Vries, RIKZ
Shift freshwater inlet points to the east and restore the marine character of the estuary Freshwater Salt water Brackish Tidal area Dams
Salt tolerant crop Quinoa (Chenopodium quinoa) Amaranth: a salt sensitive crop Adaptation of agriculture in saline areas Increasing salinity Adaptation of agriculture in response to salt intrusion
Return of reclaimed land to the sea because of high maintenance costs
Future vision..Netherlands embracing the sea...
Cancer inhibitors produced by marine sponges. Marine algae producing substances of economic value
The “Seawing” a self-supplying floating aquaculture lab
Cultivation of marine algae for fish breeding Sunlight distributed homogenously by glass fibers in algae culture Fish containers Algae production used for fish food
Plan Lely (1918) designed for land reclamation Clay Sand
Brackish water; Lely lagoon Marsh lands Sluice and tidal power unit Wadden sea Outlet Reed marshes Inlet IJssel lake Boats Draft plan “Water lily” after Kees Hulsbergen H 2 ID
The Lily lagoon anno 2100 Tekening Maarten Groot OceanLab
Schematic model of a delta with traditional management measures (left side picture) and modern management measures which should overcome the disadvantages of traditional measures (right side).
Ecosystem based approach to river basin management: Is an “opportunity driven” type of management (“joy” or “Freude-aspect”) rather than a “fear driven” type of management. Is an “opportunity driven” type of management (“joy” or “Freude-aspect”) rather than a “fear driven” type of management. Ecological and economical goals can be combined. Ecological and economical goals can be combined. It is a generic concept. It is a generic concept. Stimulates technical and non-technical innovations. Stimulates technical and non-technical innovations. Needs interaction between society and science. Needs interaction between society and science. Conclusions