朱昊彧 张浏 隗岚琳

摘要 以派河流域气象资料和流域基础信息为基础数据，采用频率分析法和小流域经验公式法推算了派河降雨与径流量的相应关系;结合流域特征，应用产流理论探索了区域降水与派河径流之间的关系;根据湿地污染物拦截的最佳水力停留时间，计算达到各河段最佳污染物拦截效果所需增加的水力停留时间。建议派河流域加强岸边带湿地保护，提高污染物拦截效率。

关键词 派河;岸边带;降雨;产汇流;水力停留时间

中图分类号 S29文献标识码 A

文章编号 0517-6611（2021）10-0190-04

doi：10.3969/j.issn.0517-6611.2021.10.049

開放科学（资源服务）标识码（OSID）：

Amplification Estimation of Hydraulic Retention Time in Pai River Riparian Zones with Wetlands

ZHU Hao-yu1，2，ZHANG Liu3，WEI Lan-lin2 （1.Hohai College，Chongqing Jiaotong University，Chongqing 400074;2.Institute of Ecological Environment，Nanjing Hydraulic Research Institute，Nanjing，Jiangsu 210098;3.Anhui Academy of Environmental Sciences，Hefei，Anhui 230022）

Abstract Based on meteorological data and basic information of the Pai River Basin，frequency analysis method and small watershed empirical formula method were used to calculate the corresponding relationship between rainfall and runoff in the Pai River Basin.Combined with the characteristics of river basin，the relationship between regional precipitation and Pai River runoff was explored by applying the theory of runoff production.According to the optimal retention time of wetland pollutants，the increased hydraulic retention time needed to achieve the optimal pollutant retention effect in each river section was calculated.It was suggested that the protection of the riparian zone wetland should be strengthened to improve the efficiency of pollutant interception.

Key words Pai River;Riparian zone;Rainfall;Runoff;Hydraulic retention time

派河位于合肥市肥西县，是巢湖重要的泄洪河流。在降雨后的产汇流过程会向河流输入大量面源污染，进而带入大量污染物进入巢湖，这一现象在洪水期尤为突出。河流岸边带湿地被证实对降雨带来的面源污染具有重要拦截作用[1]，而这种拦截作用的强度和降雨在湿地的水力停留时间具有密切相关性。水力停留时间指待处理污水在湿地中的平均停留时间，湿地对水体内污染物拦截或净化效果理论上与水力停留时间呈抛物线关系[2]。

近年来，随着社会、经济的发展，巢湖水质有恶化趋势，原因之一就是各入湖支流携带大量营养盐进入湖区，引起湖区水体富营养化[3]。为改善巢湖水环境，降低入湖污染负荷，笔者以派河流域为研究对象，计算派河流域产汇流时间和各河段河岸带湿地实力停留时间，最终获得达到最佳污染物拦截效果各河段所需要增加的水力停留时间，以期为派河流域及巢湖水环境治理提供参考。……