The storm runoff management strategy based on agricultural ditch nutrient loss characteristics in Erhai Lake, China
文献类型： 外文期刊
作者： Peng, Jiayu 1 ; Hou, Zeying 2 ; Yuan, Jing 2 ; Wu, Yue 2 ; Yang, Kunling 4 ; Lei, Baokun 6 ; Wang, Xing 1 ; Chang, Sheng 1 ; Chu, Zhaosheng 2 ; Gao, Zhiwei 4 ; Zheng, Binghui 2 ;
作者机构： 1.Chinese Res Inst Environm Sci, State Environm Protect Key Lab Drinking Water Sour, Beijing 100012, Peoples R China
2.Chinese Res Inst Environm Sci, Natl Engn Lab Lake Pollut Control & Ecol Restorat, Beijing 100012, Peoples R China
3.Chinese Res Inst Environm Sci, State Environm Protect Key Lab Lake Pollut Control, Beijing 100012, Peoples R China
4.Dali Natl Climate Observ, Dali 671003, Peoples R China
5.Hengduan Mt Disaster Weather Res Ctr, China Meteorol Adm, Kunming 650034, Peoples R China
6.Yunnan Acad Agr Sci, Agr Environm & Resources Inst, Kunming 650201, Peoples R China
关键词： Non-point source pollution; Agricultural ditch; Initial flush; Inflow condition; Storm runoff management; Peak flow interception
期刊名称：JOURNAL OF CONTAMINANT HYDROLOGY （ 影响因子：3.6； 五年影响因子：3.6 ）
ISSN： 0169-7722
年卷期： 2024 年 261 卷
页码：
收录情况： SCI
摘要： Initial flush management is an effective measure to control non-point source pollution (NPSP) in storm runoff. However, determining the parameter of the initial flush in different areas may pose challenges in storm runoff management strategies. To address this issue, Erhai Lake in China, Yunnan-Guizhou Plateau, was selected as an example for the study. Erhai Lake is a typical mesotrophic lake with the profound influence of NPSP. The NPSP control strategy in this area will provide a valuable reference for other lakes. In 2021, 289 storm events and 190 ditchwater samples were detected around Erhai Lake. The average flow in the ditches ranged from 0.004 to 0.147 m3/s, the instant total nitrogen (TN) concentration ranged from 0.28 to 91.43 mg/L, and the instant total phosphorus (TP) concentration ranged from 0.26 to 7.35 mg/L in the storm events. It was found that the concentration of pollutants was lower than expected in the initial flush period. Instead, the event mean concentrations of TN and TP were 9.3 and 2.1 times higher than in the wet seasons, showing high nutrient concentration levels throughout the entire rainfall period. To manage storm runoff effectively, a flow-processes-division method was proposed to analyze the inflow condition and pollutant removal rate in different runoff periods. The peak flow interception strategy was recommended as the optimal stormwater management plan, as it showed the highest inflow conditions and 50% pollutant removal rate. Considering the need to reduce the constant flush of stormwater runoff, it is essential to establish a healthy water cycle system to alleviate NPSP and raise the Erhai water level. The storm runoff management method can serve as a practical tool for lake areas that do not exhibit initial flush characteristics.
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