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. Nitrogen and phosphorus concentrations in Chinese river catchmentsare contributed by agricultural non-point and industrial point sourcescausing deterioration of river water quality and degradation of ecosystemfunctioning for a long distance downstream. To evaluate these impacts, adistributed pollutant transport module was developed on the basis of BTOPMC(Block-Wise Use of TOPMODEL with Muskingum-Cunge Method), a grid-baseddistributed hydrological model, using the water flow routing process ofBTOPMC as the carrier of pollutant transport due a direct runoff. Thepollutant flux at each grid is simulated based on mass balance of pollutantswithin the grid and surface water transport of these pollutants occursbetween grids in the direction of the water flow on daily time steps. Themodel was tested in the study area of the Lu county area situated in theLaixi River basin in the Sichuan province of southwest China. The simulatedconcentrations of nitrogen and phosphorus are compared with the availablemonthly data at several water quality stations. These results demonstrate agreater pollutant concentration in the beginning of high flow periodindicating the main mechanism of pollution transport. From these preliminaryresults, we suggest that the distributed pollutant transport model canreflect the characteristics of the pollutant transport and reach the expectedtarget.

Distributed source pollutant transport module based on BTOPMC: a case study of the Laixi River basin in the Sichuan province of southwest China