The Simulation of Adsorbed Phosphorus Pollution Load Based on GIS and the Theory of Blind Number in Xiaojiang River Watershed
The Simulation of Adsorbed Phosphorus Pollution Load Based on GIS and the Theory of Blind Number in Xiaojiang River Watershed
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发表时间：
2009
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通讯作者：
Li Chong-ming
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作者：
Li Chong-ming
通过分析影响三峡库区小江流域土壤侵蚀模数和输沙量模数年变化的关键因素，提出了土壤侵蚀模数和输沙量模数的动态计算方法。根据流域水文、地理和非点源污染特征，建立了流域年吸附非点源磷负荷动态分布模型。针对模型中与降雨、土壤、地形、植被、水土保持、输沙比等有关的参数具有空间不确定性的特点，引入盲数理论进行处理。应用GIS技术，对小江流域1997 ~ 2007年的土壤侵蚀模数和吸附态磷负荷进行了模拟和定量计算。模拟结果表明，降雨侵蚀因子和径流因子是影响吸附态磷污染负荷年际变化的重要因子，吸附态非点源磷的空间分布与土地利用类型密切相关，贡献率大小依次为格莱贝、混合地、草地、水田、林地和城镇用地。验证结果表明，以参数作为盲数因子的模型可成功应用于流域吸附非点源污染负荷的评价。
The dynamic calculation methods of soil erosion modulus and sediment discharge modulus were brought forward by analyzing the key factors of yearly adsorbed load variation for Xiaojiang River Watershed in the Three Gorges Reservoir Area. The dynamic distribution model of annual adsorbed non-point source phosphorus load,based on the watershed characteristics of hydrology,geography and non-point source pollution,was built up. In view of space uncertainty characteristics for parameters in the model which are related to rainfall,soil,topography,vegetation,soil and water conservation,sediment delivery ratio and so on,the theory of blind number was introduced to deal with them. Applying GIS technology,the soil erosion modulus and adsorbed phosphorus load of Xiaojiang River Watershed from 1997 to 2007 were simulated and quantitatively calculated. The simulation results showed that the factor of rainfall erosion and runoff are the important factors which effect annual variation of adsorbed phosphorus pollution load,and that the space distribution of adsorbed non-point source phosphorus was closely related to the types of land-use,and the size of contribution rate was glebe and mix-ground,grassland,paddy field,woodland and urban land in turn. The validation revealed that the established model in which parameters were taken as the factors of blind number can be successfully applied for the assessment of the adsorbed non-point source pollution load for the watershed.