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为探明深圳市观澜河流域在快速城市化过程中伴随土地利用变化的非点源污染负荷变化,基于GIS平台,运用L-THIA模型,通过校正其内设参数,模拟流域1996～2008年非点源污染负荷的空间分布及其变化.结果表明,1996～2008年的城市化过程中,TN、TP、COD这3种污染物的负荷总量都有大幅度的增长,其中TP变化最大,在13 a中增加了62.78%,TN和COD分别增加了59.73%和55.40%,TN、TP和COD等污染物高值区面积的空间分布变化在大趋势上基本一致,都是沿河道和主要交通干线向外围逐步扩张,最后连接成片;而SS的负荷总量却下降了7.59%.建设用地的扩张是非点源污染负荷及空间分布变化的主要因素,SS负荷输出最大的用地类型是水土流失严重的开发用地.以非点源污染负荷空间分布为依据,结合不同土地利用方式,可将观澜河分为4类非点源污染防治区,该结果可为流域非点源污染控制提供科学参考.
In order to find out the change of load of non-point source pollution accompanied by land use change in rapid urbanization of Guanlan River in Shenzhen, based on GIS platform, using L-THIA model, by correcting its internal parameters, The results showed that during the urbanization from 1996 to 2008, the total load of TN, TP and COD increased greatly, of which TP changed the most, Which increased 62.78% in 13 a, TN and COD increased by 59.73% and 55.40% respectively. The spatial distribution of TN, TP, COD and other high-value area was basically the same in the megatrends, The main traffic trunk lines gradually expand to the periphery and finally become pieces, while the total SS load has dropped by 7.59%. The expansion of construction land is the main factor of non-point source pollution load and spatial distribution change. The largest land load type of SS load is Based on the spatial distribution of non-point source pollution load and combining with different land use patterns, Guanlan River can be divided into 4 types of non-point source pollution prevention and control area, which can provide the control of non-point source pollution in the basin Scientific reference .