城市内河典型小河湾生态修复技术与实践探索

Ecological Restoration Technology and Practical Exploration of Typical Small River Bays in Urban Inland Rivers

文章以上海某区城市内河典型小河湾为研究对象,在充分调查分析典型河湾水位落差、岸带及基底条件、水质等情况的基础上,开展河湾生态修复技术实践。结果表明:对河湾进行修复后,河湾水质稳定趋近于河道中心线水质,本试验开展的“活性滤解带+生物飘带”耦合技术系统对河湾处水体的常规污染物具有较好的去除效果,COD_(Cr)去除率达到32.01%~55.58%,TP的去除率达到29.25%~56.00%,TN的去除率达到28.22%~49.62%,能够有效减少和稳定河湾区域水体的污染物。河湾区域是城市内河污染集中、变化敏感区域,但同时是生态修复可利用的有效空间,从改善河湾局部区域水环境的角度去改善整体河道的水质,是实践探索的主要目的。研究为探索受限空间内河道生态治理与修复技术的实践提供了一种新思路和方法,可为城市内河水环境修复和改善提供技术支撑,也为其他平原河网城市内河的河道环境治理提供有益参考。

This paper took a typical small river bay in a certain urban area of Shanghai as the research object.Based on a thorough investigation and analysis of the water level drop,shoreline and substrate conditions,water quality,and other conditions of typical river bays,the ecological restoration technology practice of river bays is carried out.The results showed that after the restoration of the river bend,the water quality in the river bend stabilized and approached the water quality at the center line of the river.The coupling technology system of"active filtration zone+biological drift zone"carried out in this experiment has a good removal effect on conventional pollutants in the water body at the river bend,with CODa removal rates ranging from 32.01%to 55.58%,TP removal rates ranging from 29.25%to 56.00%,and TN removal rates ranging from 28.22%to 49.62%,which can effectively reduce and stabilize pollutants in the water body of the river bays.This study provides a new approach and method for exploring the practice of ecological management and restoration techniques for river channels in confined spaces.It can provide technical support for the restoration and improvement of urban river environment,and also provide useful reference for the river environment management of other plain river network cities.