排水沟塘分布特性及与农田水力联系对水质净化能力的影响

发布时间：2018-06-20 12:18

本文选题：农田 + 排水　；参考：《农业工程学报》2017年10期

【摘要】：湿地是一种能够有效治理农业非点源污染的生态设施;在一些无法建设人工湿地的地区,现存的排水沟塘系统具有类似湿地的水质净化效果。为研究排水沟塘的分布以及其与农田水力联系对其水质净化能力的影响,该文以扬州市江都区昭关灌区为例,首先通过实地调查,明确研究区不同形式沟塘的分布规律,确定沟塘与农田逐级详细水力联系,然后建立理论分析模型,分别计算考虑与不考虑水力联系2种情况下,沟塘的污染物去除能力。结果表明,考虑水力联系后,污染物去除能力为不考虑水力联系的70%~84%;水质净化作用主要集中在一些面积较大的支沟和池塘。从农田排水的角度考虑,尺寸较大沟塘会出现一定的水力冗余,但是从水质改善的角度看,则有必要保留。研究区可通过较为简单的工程措施来优化水力联系,提高其污染物的去除能力。
[Abstract]:Wetland is a kind of ecological facility which can effectively control agricultural non-point source pollution. In some areas where artificial wetland can not be constructed, the existing drainage ditch and pond system has similar water quality purification effect as wetland. In order to study the distribution of drainage ditch pond and the influence of its hydraulic connection with farmland on its water quality purification ability, this paper takes Zhaoguan Irrigation District, Jiangdu District, Yangzhou City as an example, first of all, through field investigation, the distribution law of different forms of ditch ponds in the study area is clarified. The detailed hydraulic relation between ditch pond and farmland was determined, and the theoretical analysis model was established to calculate the pollutant removal capacity of ditch pond under the condition of considering or not considering hydraulic connection. The results showed that the removal capacity of pollutants was 70% without hydraulic connection, and the purification effect of water quality was mainly concentrated in some large branch ditches and ponds. From the point of view of farmland drainage, there will be some hydraulic redundancy in the larger gully pond, but it is necessary to keep it from the point of view of water quality improvement. The study area can optimize hydraulic connection and improve its pollutant removal ability through relatively simple engineering measures.
【作者单位】：扬州大学水利与能源动力工程学院;
【基金】：国家自然科学基金资助项目(51279159) 江苏高校优势学科建设工程资助项目(PAPD) 江苏省水利科技项目(2016049)
【分类号】：S27;X71

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