基于输出系数模型的丹江口库区非点源污染时空模拟

在南水北调中线工程水源地丹江口库区,以1990、2000和2007年3期LandsatTM影像为基础,通过实地考察,解译出土地利用图,辅以DEM、气象数据及相关社会经济资料,在ArcGIS支持下,使用输出系数模型对库区3期非点源污染进行空间模拟。研究结果表明：3年库区非点源污染TN负荷总量依次为3.325万、3.379万和3.710万t;TP负荷总量分别为0.167万、0.169万和0.186万t。TN、TP最大来源分别是旱地和人类生活排放。河南淅川县污染负荷强度最大,应列为重点治理区域。

Application of Export Coefficient Model in Simulating Pollution Load of Non-point Source in Danjiangkou Reservoir Area

Danjiangkou Reservoir Area（DRA） is the source of water for the Middle Route Project under the South-to-North Water Transfer Scheme in China.Based on remote sensing images（Landsat TM） in 1990,2000 and 2007,associated with DEM meteorological data and the corresponding socio-economic data,export coefficient model was used in DRA and parameters were obtained from a pollution model and references.Using this method under ArcGIS,the TN pollution load in this area has a small change from 3.325×104 t in 1990 to 3.379×104 t in 2000,then it increased to 3.710×104 t in 2007;the TP pollution load in the 3 years were 0.167×104 t,0.169×104 t and 0.186×104 t,respectively.The main source of TN pollution load was dry land,and most of the TP pollution load generated from people produce.Intensity analysis showed region of Xichuan country was the highest non-point source pollution load area,then should be gained more attention in the future.