The study of the influence of typhoon and rainfall on relation between runoff and runoff coefficient

• Main Authors: Cheng-Yi Lu, 呂政宜
• Other Authors: 林意楨
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/80154202932532767655

碩士 === 淡江大學 === 水資源及環境工程學系碩士班 === 96 === Thesis studies used the measured river discharges and rainfalls from different watersheds for different typhoons and rainfall events. The Rational Formula is analyzed the relation between runoff coefficient and runoff . GIS is calculated slopes and landuses in different watersheds. Compared between concentration times, rainfall intensity, slopes, and landuses, and we analyzed the relation between landuses and the runoff coefficient. It collected the daily runoff and rainfall data from five different watersheds from 1997 to 2006, and the five different typhoons’ data which are Amber, Toraji, Mindulle, HaiTang, and Talim had also been gathered. And it calculated the time of concentration, the rainfall intensity, and runoff coefficient in different watersheds, and it analyzed the relation between runoff coefficient and runoff. From the results, we known that in the rainfall events shown the better agreement in the linear regression analysis. In GIS application on DTM, three type of slope, Ⅰ(0%~5%), Ⅱ(5%~40%), and Ⅲ(＞40%), were use to study the slope effects on the relation between river discharge and surface runoff. From the analyses’ results, the time of concentration was directly proportional to the degree of slope. According to different landuses, we discussed the relation between the degree of the developmens and runoff coefficients. The results of this research showed, besides Ma-An-Chi Bridge and Ma-Yeuan Bridge, landuses were better and run-off coefficient were better in the typhoon events.In the effective rainfall''s events, landuses were better and run-off coefficient were better in all watersheds.