tailieunhanh - Numerical simulation of morphology in the tidal environments

Numerical simulation of morphology in the tidal environments. It is very important to understand the geomorphic changes in the lagoon to preserve the environment. Dynamic landscapes shaping riparian and aquatic habitats are made up in the complex channel network of the lagoon. And there are a lot of riparian wildlife such a fish and birds in the diverse habitats of it. | NUMERICAL SIMULATION OF MORPHOLOGY IN THE TIDAL ENVIRONMENTS Yasuyuki Shimizu Professor of Laboratory of Hydraulic Research Division of Engineering and Policy for Cold Regional Environment Graduate School of Engineering Hokkaido University Japan Email yasu@ 1. INTRODUCTION The effects of global climate changes occur in the rising sea level higher lake level stronger more frequent storms and extreme temperature. And these changes will have real impacts on the natural environment as well as human-made infrastructures. For example Acqua alta or high water flooded Venice in Italy with more a meter of salty lagoon water in December 2008. The acqua alta which was the most extreme in 22 years reached 156 cm and flooded most of the city Figure 1 . The activities and economics of the city were damaged due to the flood. Venice is planning to construct floodgates at the Lagoon s entrances to decrease the flood damages. But it remains to be seen whether acqua alta can be tamed without closing off the Lagoon from the sea and turning it into a freshwater lake. Recently the wetland areas in the Lagoon is decreased to 30 of the area in 1810 by the human activities Figure 2 which affected the decrease of the sediment inflow to the Lagoon the increase of sediment discharge from it the rising sea level and the settlement of the ground. It is very important to understand the geomorphic changes in the lagoon to preserve the environment. Dynamic landscapes shaping riparian and aquatic habitats are made up in the complex channel network of the lagoon. And there are a lot of riparian wildlife such a fish and birds in the diverse habitats of it. Several attempts to improve urban environment supply an excellent place to relax and enjoy the scenery have made by using the unique geomorphology and natural environments as a part of city. For example Station Island near New York in the United States is a waste landfill site Figure 3 . However nature restoration works has been .

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