基于GIS的农业面源污染风险评估

为满足农业面源污染控制实际需要,建立一种农业面源污染风险评估方法。该方法以农业面源污染风险影响因素分析为基础,建立面向农业面源污染风险评估的GIS空间分析模型,在GIS支持下,实现模型所需数据的提取及分析运算,获得多尺度农业面源污染风险程度分布图,为农业面源污染控制提供工作目标区。以杭埠河流域为样区进行模型应用,获得了较精确的计算结果;农业面源污染风险评估方法对监测地区基础数据要求不高,是一种可行的污染监测新途径。

Research on Risk Assessment of Agricultural Non-Point Source Pollution with GIS

In order to meet the needs of agricultural non-point source pollution control, on the base of analysis of the effect factors of agricultural non-point source pollution, the risk assessment model for agricultural non-point source pollution are established. GIS was employed to derive all the data and evaluate model in order to get spatial variance and distribution of the risk levels on different scales within study area. The evaluation results can supply the pollution control with target areas. The model was evaluated at 100m grid cell in Hangbuhe river watershed. The evaluation does not have high demands on basis data, and its results are accurate. There is a potential for the method to be used for pollution control under the limited data conditions as Hangbuhe river watershed.