Evaluating the perennial stream using logistic regression in central Taiwan

Monday, 15 December 2014
Tjuku Ruljigaljig1, Youg-Sin Cheng2, Hung-I Lin2, Cheng-Haw Lee2 and Teng-To Yu2, (1)National Pingtung University, Pingtung, Taiwan, (2)National Cheng Kung University, Tainan, Taiwan
This study produces a perennial stream head potential map, based on a logistic regression method with a Geographic Information System (GIS). Perennial stream initiation locations, indicates the location of the groundwater and surface contact, were identified in the study area from field survey. The perennial stream potential map in central Taiwan was constructed using the relationship between perennial stream and their causative factors, such as Catchment area, slope gradient, aspect, elevation, groundwater recharge and precipitation. Here, the field surveys of 272 streams were determined in the study area. The areas under the curve for logistic regression methods were calculated as 0.87. The results illustrate the importance of catchment area and groundwater recharge as key factors within the model. The results obtained from the model within the GIS were then used to produce a map of perennial stream and estimate the location of perennial stream head.