Closure of "Nonpoint-Pollution Model Sensitivity to Grid-Cell Size"
Closure of "Nonpoint-Pollution Model Sensitivity to Grid-Cell Size"
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DOI：
10.1061/(asce)0733-9496(1993)119:2(141
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发表时间：
1993-03
影响因子：
3.1
通讯作者：
B. Vieux;Scott Needham
中科院分区：
文献类型：
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作者：
B. Vieux;Scott Needham
非点源污染模型估计了使水质恶化的化学物质、沉积物和营养物质的负荷。在实施控制之前，必须确定流域流域的污染位置和严重程度。地理信息系统(GISS)是一种计算机自动化的数据管理系统，简化了空间信息的输入、组织、分析和制图。由于非点源污染模型模拟的是分布式流域过程，因此必须将非均质的复杂地表划分为网格单元等计算单元。模型参数可以使用地理信息系统直接从地图中的每个栅格单元中获取。然而，如果任意确定单元格大小选择，即使不是错误的结果，也会产生模棱两可的结果。利用地理信息系统对农业非点源污染模型(AGNPS)的输入参数进行了敏感性分析，研究了单元大小选择的影响。模型网格单元格...
Nonpoint‐pollution models estimate loadings of chemicals, sediment, and nutrients that degrade water quality. Before controls can be implemented, location and severity of pollution must be identified in the watershed basin. Geographic information systems (GISs) are computer‐automated, data management systems simplifying the input, organization, analysis, and mapping of spatial information. Because nonpoint‐pollution models simulate distributed watershed basin processes, a heterogeneous and complex land surface must be divided into computational elements such as grid cells. Model parameters can be derived from each grid cell directly from maps using GIS. Cell size selection, if arbitrarily determined though, yields ambiguous if not erroneous results. This paper investigates the effects of cell size selection through a sensitivity analysis of input parameters for the nonpoint‐pollution model, Agricultural Nonpoint Source Pollution Model (AGNPS), using a GIS for a small research watershed. Model grid‐cell si...