负荷历时曲线法在赣江流域TMDL计划中的应用

赣江流域是鄱阳湖水系的第一大流域，由于人口密度大、企业多，使得赣江流域的水环境日趋严重。为此，以赣江流域为对象，选择外洲站点为代表性站点，绘制赣江流域污染物的流量历时曲线和负荷历时曲线；并分析污染物最大日负荷的变化特征，赣江流域各月、各季节和各水情期的污染物最大日负荷波动较大，各时间段的污染物最大日负荷呈负偏态分布；最后比较了赣江流域现状负荷通量和允许负荷通量，发现赣江流域总体水质较好，COD有部分盈余，但NH3 N和TP的现状负荷已接近最大允许负荷，尤其在丰水期，说明面源对赣江流域的NH3 N和TP的贡献较大，赣江流域的污染物控制应以面源控制为主

APPLICATION OF LOAD DURATION CURVE METHOD IN THE GANJIANG RIVER TMDL PROGRAMME

Ganjiang River Basin is the biggest basin of the Poyang Lake water system. Due to the large population density and a lot of enterprises, water environment in the Ganjiang River Basin has become increasingly serious. This study takes Ganjiang River Basin as the research object. We chose Waizhou site as a representative site, and used the Load Duration Curve method to draw the basin pollutant flow duration curve, and load duration curve, and obtain the maximum daily load of pollutants under different guarantee rate. We analyzed the change features of pollutant maximum daily load, and found that pollutant maximum daily load fluctuation during each month, season and water phase was bigger, each period of pollutant maximum daily load showed negatively skewed distribution, formulating different periods of pollutant total control is of great significance. Months average maximum daily load range for COD was 1 38006 t/d-7 42893 t/d, the strongest average daily pollutant carrying capacity was June, the weakest was December. The sequence of the strength of the pollutant carrying capacity of each season: summer > spring > autumn > winter; each season average pollutant maximum daily load ratio was: 3.08〖DK〗∶3.01〖DK〗∶1.24〖DK〗∶1. The sequence of the strength of the pollutant carrying capacity of each water phase was: wet season>level period 2> level period 1> dry season, and each water phase average pollutant maximum daily load ratio was: 386〖DK〗∶222〖DK〗∶151〖DK〗∶1. Water phase change characteristics can more intuitively reflect the pollutant maximum daily load changes, and discrimination of pollutant maximum daily load among wet season, level period, dry season was bigger. Finally,we compared the present load of Ganjiang river basin and allowable load fluxes, found that the water quality of Ganjiang river basin was better in general, COD had a part of surplus, but the present load of TP and NH3 N had been close to the maximum allowable load, especially in the high flow period. It indicate that non point source information of the Ganjiang river basin of NH3 N and TP is larger, the regulated pollutants of Ganjiang river basin should give priority to non point source, and focus on the control of NH3 N and TP