Application of load duration curve to analyze the phosphorus capacity of Hebei Section of Yongding River Basin
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摘要: 以永定河流域2002—2016年水文数据为依据,利用负荷历时曲线(LDC)法计算永定河流域河北段老鸦庄、左卫、石匣里、响水堡和八号桥5个断面的总磷(TP)纳污能力,并分析纳污能力的时空变化;结合2010—2016年水质监测数据,计算各断面水体TP现状负荷,分析其主要污染源类型与污染负荷应削减量。结果表明:永定河流域河北段水体TP纳污能力时空差异较大,下游纳污能力大于上游;5个断面不同月份、季节的TP允许负荷波动较大,强纳污能力主要集中在7月、10—11月,而1—2月纳污能力较弱;永定河流域河北段主要受非点源污染排放的影响,除老鸦庄断面在丰水区和中流量区TP负荷无需削减外,其他4个断面在丰水区、中流量区和枯水区均需进行不同程度的削减。永定河流域河北段水体TP现状负荷已超过允许负荷,需要制定不同时间尺度的总量控制目标与方案。
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关键词:
- 总量控制 /
- 负荷历时曲线(LDC) /
- TP /
- 纳污能力 /
- 永定河流域
Abstract: The capacity of total phosphorous (TP) of five control sections (Laoyazhuang, Zuowei, Shixiali, Xiangshuipu, Bahaoqiao) in Hebei section of Yongding River Basin was calculated by load duration curve (LDC) method, and the temporal and spatial changes of pollutant capacity was analyzed based on the hydrological data of Yongding River Basin from 2002 to 2016 . Combined with 2010-2016 water quality monitoring data, the current pollution load of TP in each section of water was calculated, and the main types of pollution sources and the pollution load that should be reduced were analyzed. The results showed that there was great difference of TP capacity in time and space in Hebei section of Yongding River Basin, and the capacity of TP in downstream was relatively larger than that in upstream. TP capacity in five sections fluctuated greatly in different months and seasons, and the highest capacity of TP was mainly in July, October and November, while the lowest was mainly on January and February. Hebei section of Yongding River Basin was mainly affected by non-point source pollution emission. TP load of the other four sections needed to be reduced in different degrees in the high flow area, medium flow area and low flow area except for Laoyazhuang section in high flow area and medium flow area. The current TP load in Hebei section of Yongding River Basin exceeded the allowable load, so it was necessary to formulate total amount control targets and schemes at different time scales.-
Key words:
- total amount control /
- load duration curve (LDC) /
- total phosphorus /
- capacity /
- Yongding River Basin
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