| 瞿 畏,龚丽玲,范庆元,刘 辉,杨 楠,陈 宏.干挖法清淤对湖区垸内沟渠地表水环境质量的影响[J].江西水利科技,2020,(3): |
| 干挖法清淤对湖区垸内沟渠地表水环境质量的影响 |
| Effect of dry excavation dredging on environmental qualification of surface water of Ditches in a lake area |
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| DOI： |
| 中文关键词: 清淤 水环境容量 水质 富营养化评价 干挖法 地表水 |
| 英文关键词: Dredging Water environment capacity Water quality Eutrophication assessment Dry excavation Surface water |
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| 中文摘要: |
| 干挖法清淤是改善湖区垸内沟渠地表水环境质量的重要手段，本文通过现场调研与采样分析了南汉垸内沟渠在清淤前后的地表水水质及其变化特征，评价了沟渠地表水环境容量及其富营养化水平.结果表明：1）沟渠采用干挖法清淤后，地表水质随清淤完成时间延长而变差；2）沟渠高锰酸盐指数的水环境容量由清淤前的13.99t/m增加到清淤一个月后的38.88t/m；而总氮、总磷的水环境容量分别增加了2.8倍和2.7倍；3）清淤前垸内沟渠地表水养殖及排污区达到重度富营养化程度，清淤后∑TLI值随清淤完成时间增加呈增加趋势.南汉垸内农业面源与养殖排污的外源输入是导致清淤后水环境质量变差的主要原因，有必要加强监测并定期清淤.本研究可为沟渠清淤治理中的水环境保护提供依据. |
| 英文摘要: |
| Dry excavation is a vital dredging method to improve the surface water environment quality of ditches in the Nanhan embankment.In order to investigate the effect of the surface water environment quality，water environmental capacity，and the eutrophication index of water by dry excavation dredging.Taking the ditches in Nanhan embankment as the research object，the water sample，water environment capacity，and eutrophication evaluation results of the ditches before and after dredging were analyzed and discussed.The result shows：1）The surface water quality becomes worse with the completion of dredging.2）The water environmental capacity of the ditch with high ferocity index increased from 13.99 t/m before desilting to 38.88 t/m one month after desilting.The water environmental capacity of TN and TP increased 2.8 times and 2.7 times，respectively.3）Before dredging，the surface water cultivation and drainage area in the ditch inside the embankment reached the degree of severe eutrophication；after dredging，the ΣTLI value increased with the completion of dredging time.The main reason for the decreasing control effect of dredging by dry excavation is the input of agricultural non-point sources and aquaculture sewage.Therefore，the realtime monitoring of surface water in the embankment should be carried out，and new dredging projects should be started in time.The results can provide a theoretical basis for dredging treatment of rivers or ditches. |
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