A Study of Subsurface Flow at Fushan Experimental Watershed NO.1 Weir

• Main Authors: Chih Hung Peng, 彭智弘
• Other Authors: Hsin Hsiung Chen
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/84291192782193171892

碩士 === 國立臺灣大學 === 森林學研究所 === 87 === Fushan experimental watershed is a very good experimental area for forest ecosystem .The topographical feature 、hydrological structure、subsurface hydrology of watershed are unique which may influence one another. Specially order to monitor the dynamic trend of subsurface flow plays an important role in the change process. The Ha-Pen stream is one of the main streams at Fushan. The NO.1 weir can measure flow in Ha-Pen stream. But we found that the flow measured from NO.1 weir is much smaller than the rainfall recently. Besides the Hydrology loss ,for example Evapotranspiration、Depression storage、infiltration...etc, we believe that there is still huge subsurface flow loss from watercourse. In order to find the evidence to prove there is subsurface flow under NO.1 weir , we do some tests such as Earth Specific-Resistivity Method、subsurface flow tracing、subsurface flow logging. At last , we detect there is huge subsurface flow loss from watercourse. The quantity of per unit square meter is 253m/day.