安徽合肥四里河生态修复策略研究

Research on the Ecological Restoration Strategy for Sili River in Hefei,Anhui Province

四里河是位于安徽省合肥市庐阳区的一条防汛河道,全长约5.45km。2 000多年来,四里河与南淝河一起见证了合肥古城的兴衰更迭,然而近年来,四里河逐渐出现了水体污染严重、生态系统退化、水陆过渡带消亡等问题。从生态视角出发,运用目标分析法,从河流水质水文整治、多样性地貌恢复以及乡土生物恢复3个方向展开,采用橡胶坝控制水系源头、绞吸船机械清淤和富氧浮选提高河水活性等方式,改善水体质量;通过改建驳岸形式、增建湿地公园和种植水生植物带等工程技术措施,恢复堤岸过渡带,修复湿地地形地貌,恢复乡土生物种群,以期为城市河流的生态修复工程提供参考和借鉴。

Sili River,a flood-discharging waterway,is located in Luyang District,Hefei,Anhui Province,with 5.45 mile length.Sili River and Nanfei River witness the rise and decline of this ancient city for two thousand years silently.However,Sili River is getting polluted seriously,with ecological degeneration,landwater transition zone disappearance and other realistic problems in recent years.This research is based on the ecological view,by using the method of objective analysis,and studies from three aspects:hydrological recovery,geomorphic landscape diversity restoration,landscape promotion and habitat restoration.Setting rubber dam to control the source of river system,dredging by cutter suction dredger mechanically and adopting oxygen-rich floatation method are to enhance the water activity.Recovering the land-water transition zone,restoring topography of wetland and local biological population are achieved by the method of revetments transforming,wetland rebuilding and aquatic vegetation planting.The study can provide reference for ecological restoration projects of urban rivers.