报告题目：Can Current Stormwater Engineering and Stream Restoration Practices Maintain Pre Development Runoff Hydrology, Water Quality and Biotic Integrity in Urbanizing Watersheds: A 10 year Overview of the Beaverdam Creek Watershed Study.目前暴风雨工程与河流修复技术是否能维持城市化流域中的径流、水质以及生物完整性——比弗丹溪流域研究的十年回顾

主讲人：Craig J. Allan

开始时间：2012-9-4 13:30

地点：理科大楼A510

报告人简介：

Craig J. Allan, Professor and Chair, Dept. of Geography and Earth Sciences, University of North Carolina at Charlotte, 9201 University City Blvd., Charlotte, N.C., U.S.A., 98223, cjallan@unc.edu.

报告摘要：

Researchers have monitored the hydrology, geomorphology, water quality and aquatic macro invertebrate community structure of the rapidly developing Beaverdam Creek Watershed in western Mecklenburg County, North Carolina, U.S.A since 2003.  The purpose of this study was to assess whether current development regulations which require the inclusion of significant stormwater control infrastructure is sufficient to maintain pre development runoff hydrology, meet water quality targets, and maintain both the geomorphic integrity and biotic integrity of the impacted stream system which drains into an important water supply reservoir.  Owing to the extremely short pre development monitoring period and continuous disparate land use alteration that occurred during the 10 year development cycle, we have employed a combination of hydrograph, time series and statistical analyses (unit hydrograph, unit impulse, Mann-Kendall Trend Test) and distributed modeling approaches (MUSIC) to assess the effectiveness of the stormwater control and restoration measures in meeting the required post development hydrologic and water quality outcomes.  Our results indicate that sediment delivery and turbidity levels were most impacted during the initial installation of the sanitary sewer infrastructure and during the conversion of the sediment control basins into water quality control basins during the post construction period.  Nitrogen export appeared to be little impacted by watershed development.  However, phosphorus losses have increased two to five times over predevelopment levels and are of concern given the sensitivity of the receiving reservoir to eutrophication.  Suburban lawns appeared to be the primary source for phosphorus within the developed suburban neighborhoods.  Model results indicate that the routing of 50% of the runoff from developed areas through additional bioretention would be sufficient to meet post development water quality targets.  Model simulations also suggest that the installation of individual stormwater control measures (SCMs) such as rain gardens at the lot scale would provide little water quality benefit.