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采用分布式水文模型(GBHM2),基于GIS/RS平台,按照渭河流域现状地理、地貌、土地利用类型、植被覆盖条件和2004年社会经济情况,构建了模型需要的空间数据库与属性数据库,模拟了研究区域渭河流域现状条件下,9个子流域日径流量的变化,取得了满意的成果。在此基础上,借助GIS技术,分析了流域工业与生活污染源CODCr在各模拟子流域中的分布情况,结合流域丰、枯水期CODCr这一特征指标的变化,同时考虑了流域点源与面源有机污染负荷的影响,确定了各模拟子流域年CODCr污染负荷消减系数,实现流域水环境功能目标,流域模拟年CODCr污染负荷削减总量为15.7万t。
According to the present geography, geomorphology, land use types, vegetation cover conditions and socioeconomic conditions in 2004, based on the GIS / RS platform, the distributed hydrological model (GBHM2) was used to construct the spatial database and attribute database required by the model. Under the current conditions in Weihe River Basin, the daily runoff of 9 sub-basins was changed and satisfactory results were obtained. Based on this, the distribution of CODCr, an industrial and domestic pollution source in the watershed, was analyzed with the help of GIS technology. Combining with the change of CODCr characteristic in both catchment and dry season, the effects of point source and surface source organic The annual CODCr pollution load reduction coefficient of each simulated sub-catchment was determined to achieve the functional target of water environment of the river basin. The total amount of CODCr pollution load reduction in the catchment simulation year was 157,000 t.