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106/05/23 14:00 臺灣海洋大學應用地球物理研究所邱永嘉副教授 演講
演講公告
張貼人：網站管理員 ╱ 公告日期：2017-05-16演 講 公 告
主講人：邱永嘉 副教授
地點：中央大學科學一館S-325教室
摘要：
講題：Using Heat as a Tracer to Estimate Water Flux Exchanges between Stream and Groundwater
主講人：邱永嘉 副教授
臺灣海洋大學應用地球物理研究所
時間：05月23日（星期二）下午2點
地點：中央大學科學一館S-325教室
摘要：
Streambed water flux exchanges is the movement of water from a river into the beneath sediments and then back into the river. This interaction between river and streambed is considered as a fundamental role in the functioning of riparian ecosystems. Chichiawan Watershed located in central Taiwan is the only habitat for the endangered species of formosan land-locked salmon and such dynamics of downwelling/upwelling flow within the streambed can affect the survival of salmon. In order to investigate the interaction between river and streambed, heat is used as an environmental tracer to determine the water exchanges within the streambed and estimate the hydraulic conductivity of sediments. The detailed hydrographs, thermographs, and vertical temperature profiles obtained along the Yusheng Creek, a tributary at the upstream of Chichiawan Creek, were presented and used to estimate the streambed water exchanges. Results showed that the Yusheng Creek along the monitoring section is a losing stream and its downwelling flux increases from up- to down-stream. When the consecutive dry days over a period of time increase significantly, the stream changed from perennial to intermittence and an unsaturated zone beneath the streambed surface appeared. According to the measured temperature and water level data, the numerical model of VS2DH was used to quantify the vertical fluxes and hydraulic conductivities of streamed. The potential mechanisms causing the creek transited from perennial to intermittence and becoming a losing disconnected system need further study.
最後修改時間：2017-05-16 AM 11:43
