莫拉克颱風後土地利用變遷對林邊溪集水區水文機制之影響

文化大學機構典藏 CCUR > 理工學院 > 理學院 > 地理學系 > 博碩士論文 > Item 987654321/26502

jsp.display-item.identifier=請使用永久網址來引用或連結此文件: https://irlib.pccu.edu.tw/handle/987654321/26502

题名:	莫拉克颱風後土地利用變遷對林邊溪集水區水文機制之影響 Effects of land use and cover change induced by typhoon Morakot on hydrological processes in Linbian Watershed, Taiwan
作者:	達西妮 Waniganeththi, Dharshanie
贡献者:	地學研究所地理組
关键词:	Runoff coefficient Land cover change Typhoon disasters Spatial analysis Physical disturbance
日期:	2014
上传时间:	2014-01-09 15:36:17 (UTC+8)
摘要:	This study analyzes the significant impacts of Typhoon Morakot on land cover and hydrology. The occurrence of typhoons following debris flow is a major indicator of natural disturbance. The hydrological response for Linbian Watershed to land use change was assessed from 2006 to 2012. Land use changes were assessed by three satellite images corresponded to the typhoon in the southern part of Taiwan. Hydrological processes response is also assessed as the change in quantities of runoff and runoff coefficient. The aim of this study is to investigate the land use change influence on the change in runoff coefficient at the Linbian Watershed. The analysis comprises two approaches including temporal and spatial changes. Land cover change and monthly rainfall distribution of the watershed were analyzed before and after the typhoon. The study watershed was dominated by high vegetation cover before the typhoon. Land cover results indicated that 30% of the vegetation has been converted to bare land after Typhoon Morakot, representing the largest area decrease during the study period. Highest monthly rainfall (3916mm) was recorded in the month of August 2009, due to the typhoon. Rainfall and runoff relationship was used to estimate the upper and midstream runoff, which was used to predict the runoff coefficient. This study found that decreasing vegetation area in the basin affected the increase of runoff and runoff coefficient. Three years after the typhoon, the land cover showed that vegetation cover has been recovering. Similarly runoff coefficient and runoff values were stabilized after the typhoon. This analysis reveals that there is a relationship between the vegetation cover and the runoff. This proposed approach also successfully quantifies the effect of typhoons on land cover and the impact on hydrology.
显示于类别:	[地理學系] 博碩士論文

文件中的档案:

档案	描述	大小	格式	浏览次数
102PCCU0136003-001.pdf		1983Kb	Adobe PDF	329	检视/开启

检视Licence

在CCUR中所有的数据项都受到原著作权保护.

数据加载中.....