Abstract:

In order to study nonpoint source nutrient from Xiangxi River,considering the characteristics of the land use and the basin network,establishing the regular quality monitoring and hydrographic control section respectively in 3 major branches and upstream main channel.According to the water quality and quantity monitoring data,studying the spatial and temporal variation of the water quality from the upstream and the flux output process during raining,distinguishing the contribution of nonpoint and point source pollution load by digital filtering technology.The results demonstrate:controlled by agriculture nonpoint source pollution,TN is in GL＞GF＞NY,because of the point source pollution from P enterprise,TP is in NY＞GL＞GF; the correlation coefficient of flow and rainfall is 0720 2;annual load ratio of TN and TP is 61% and 40%,during raining,the TN and TP contribution from nonpoint source pollution is 752% and 709%;the pollution load is decided by the runoff,the correlation of TN/TP load and runoff is that TN is 0963 6,and TP is 0978 9