Research On The Feasibility Of The DaXiaoChan Island Project And Its Influences On Environments

All of whichever Marine Areas are synthesizing of resources and environments, the development of marine areas should be scientifically laid out in space so as to prevent the contradictions between exploitation and preservation or relatively close project, therefore, it can form a rational production structure and maintain the sustainability of the marine ecological environment and marine resources.DaXiaoChan Island project will start with the establishment of cofferdam around DaChan Island and XiaoChan Island, then new reclaiming land from the sea will be created by putting the sullage into the cofferdam from Tonggu deep channel. The program will partially change the marine areas attributes, it is only through scientific and rational argumentation and evaluation over the resource and environment that we can provide scientific and objective evidence for the practice of DaXiaoChan Island project and offer theory basis for the reasonable development of Pearl River estuary.This paper will give a overall, multi-subject study and evaluation over the environment influence from practice of construction for the DaXiaoChan Island project.We can draw our conclusion over the environmental effects, social results and economic benefits on the practice of the project from the point of hydrometeorological material such as the wind, tides, waves, flow and the landscape material such as sands, marine surface sediment, coastal submarine topography erosion.Do make a prediction about the alternation of velocity and orientation of water, changes of wave field, the rate of distribution on overflowed slit and coastal submarine topography, with the combination method of 3-D hydrodynamic model,reeled-refraction model and mud model after projects. And then analyze the influence constitution of environment of the nearby marine areas.During the Point-out Projects building, the temporary increasing content of suspended material, the reasonable and inevitable loss related to the creatures living at the bottom of landfill area and provisory influence to the halobios resource , which caused by the slit overflowing. The installed point-out overflow port in the western part of projects bring the least minimum influence to breed aquatics district set in the DaChan Gulf as well as the stability of eastern shallow draft waterway in the safeguard.The elements as velocity, orientation of flow and the tide height will lead to a very little bit change. The fact that any alternation will not exist on the impacts to the western storm-surge-proof.After pointing out the DaXiaoChan Island project, the new change of erosion will take between the shoal close to sea and submarine topography, the western submarine of the connected Islands are basically erosion district, eastern shallow draft waterway are basically stability, there is little change between southeastward of DaChan Islands and northwestward of XiaoChan Islands in the state of erosion. After DaXiaoChan Island project are finished, the paralleled man-made coastal makes the stream more smooth, which results the alternation of velocity that is useful to maintenance the waterways.