基于WebGIS三峡干流水质模拟平台研究

三峡蓄水成库后仍属于典型的河道型水库，其总体水流、水质运动特性符合一维水流水质运动规律。针对三峡库区总体水流、水质运动特性，采用一维水流水质模型对三峡库区水流和水质进行了模拟。以该模型为核心，利用Web Services技术开发并在互联网上发布了模型服务，在此基础上采用成熟的WebGIS和富客户端Flex等技术构建了适用于三峡库区的干流水质模拟平台；能够实现包括各计算断面流速、流量、水位以及污染物浓度时空过程在内的三峡库区干流流速场和浓度场的数值模拟。以库区干流清溪场至十里铺断面内的江段作为模拟实例，利用该平台模拟计算江段内水流和水质状况，并以水文水质同步观测数据对模拟结果进行验证，结果表明其具有较好的模拟效果；为三峡库区污染物总体输移扩散特性研究提供了有利工具，同时也为国家和地方政府进行库区水环境决策提供了技术支持

NUMERICAL SIMULATION PLATFORM OF MAIN STREAM WATER QUALITY WITHIN THE THREE GORGES RESERVOIR AREA BASED ON WEBGIS

The Three Gorges Reservoir is also typical river reservoir after impoundment,and its general movement characteristics of flow and water quality conform to the movement principle of one-dimensional flow and water quality.Aiming at general movement characteristics of flow and water quality in the Three Gorges Reservoir Area(TGRA),the one-dimensional flow and water quality model is used to simulate the flow and water quality in the TGRA.With one-dimensional flow and water quality model as the core,a serial of model services are developed and disseminated through internet using the WebServices technique.Based on those model services,the numerical simulation platform of main stream water quality within TGRA is established using mature WebGIS and RIA Flex techniques.The platform realizes the numerical simulation of the main stream flow velocity field and concentration field in TGRA,including the spatial and temporal simulation of velocity,flow,water level and pollutant concentration in every computation cross-section.Taking the mainstream Qingxichang-Shilipu section in TGRA as case,the research simulates the flow and water quality and validates the simulation result using simultaneous observation data of hydrology and water quality in field.The result shows that the platform can be well used in the flow and water quality simulation.The platform provides a good tool to the study on the overall characteristics of the contaminant transport and diffusion,and provides the technique support to the government and local departments in water environment decision making as well.