Ecological Environment Risk Assessment And Aversion Of Operation Of Western Route Of South To North Water Transfer Project

The Project of Western Route of South to North Water Transfer Project is animportant project that across the two basins for optimally allocating water resources inChina. The area that the project would be sited has several distinguishing features,such as frigid weather, uneven humidity, fragile ecological balance and sensitiveenvironment. Operation of the reservoirs of the project will change original balance oflocal water resources and will influence local ecological environment in differentdegrees. Thoroughly and systematically researching ecological environment riskimposed on the area by operation of the reservoirs has prospective instruction andbasic technological support for scientific planning and effective operation of theproject.Based on systematic methodology, from different time scale and spatial scale,this thesis researches thoroughly the local ecological environment risk imposed byoperation of the reservoir from six aspects, such as local climate, river corridor, marsh,arid river valley, natural reserve and water environment. The concrete contents can besummarized as following:(1) Basic theories of risk assessment on ecological environment influence aresorted. Basic theories of risk identification, assessment and adverse are elaborated; therisk source, risk receptor and risk formation mechanism are analyzed.(2) The ecological environment risk factors in the water transfer area areidentified. The influence range, influence class and influence degree are studied;integrated method of risk assessment is proposed; and spatial range of risk assessmentis determined.(3) A simulation platform for local ecological environment risk analysis isconstructed. A framework of the climate-hydrology-ecology coupling model platformis designed; the model structure and feature course simulation are discussed; a database working on network is developed; and the climate-hydrology-ecology couplingmodel is developed.(4) Quantitative risk is evaluated on the ecological environment influence. Fromdifferent time scale and spatial scale, the risk is assessed from six aspects, such as local climate, river corridor, marsh, arid river valley, natural reserve and waterenvironment; based on the quantitative results, through expert assessment system,different influence levels are classified and integrated assessment results areconcluded.(5) A series of measures for ecological environment risk aversion are proposed.Based on the risk analysis and quantitative assessment results, according to ecologicalhydrology development mechanism, the integrated risk aversion measures areproposed from different aspects and levels.