圖書典藏及影音數位平台

鹽水溪下游豐化橋至河口段水道幾近平坦，平均坡降約為1/3,000，河幅廣闊且易淤積，為標準之平地河川，中游新南北寮橋至豐化橋段水道坡降約1/700，屬淺山河川；那拔林溪下游匯入鹽水溪，匯流口段為順直河川，上游河段蜿蜒於山谷中，水道坡降約1/175。鹽水溪下游河段河幅寬廣，且堤防多已興建，故流路穩定，中游河段雖已設置堤防，但由於河道淤積嚴重，流路較不穩定，變遷程度較高，上游河道寬度較窄，兩岸多直立岸壁，流路雖屬蜿蜒，但變遷程度較低；那拔林溪河幅較小，雖僅有下游匯入鹽水溪處設置堤防，中上游河道兩岸地形穩定，流路亦穩定。

River development and management in Taiwan before over-emphasized water treatment engineering, but less considered the whole environmental ecology. In recent years, since environmental protection consciousness has been more and more important, there is a need to do more investigation to make up the shortage of existing material which should be integrated for the reference of public. To promote river business, river management, environmental conservation and rehabilitation, and provide the reference of natural treatment design for hydraulic engineering institute, all the basic material including Humanities, physiographic, hydrological data, biological, space utilization need to be collected in this project. The project is to investigate river situations, including Yanshuei River, Nabalin River. The work target is to compile GIS ecosystem data as unit of river for the whole Yanshuei Rivershed and to build it into the database at the website for the Management Information System of River’s Investigation.