A Shoreline Analysis using DSAS in Nam Dinh Coastal Area
Dang Van To
Department of Oceanology - Meteorology – Hydrology, University of Natural Sciences, 227 Nguyen Van Cu Dist. 5, Ho Chi Minh City, Vietnam
Pham Thi Phuong Thao
Department of Oceanology - Meteorology – Hydrology, University of Natural Sciences, 227 Nguyen Van Cu Dist. 5, Ho Chi Minh City, Vietnam
要旨
The shoreline change in Nam Dinh province in Vietnam is a chronic problem. Based on the 87-year historical data from 1905-1992, the shoreline change in Nam Dinh was re-analyzed using the ArcView extension entitled DSAS (Digital Shoreline Analysis System). The rates of changes was calculated by four statistical methods, namely, End Point Rate (EPR), Average of Rates (AOR), Linear Regression (LRR), and Jack-Knife Rate (JKR). The computational results show that there is beach erosion in Hai Hau and a beach accretion in Nghia Hung and Xuan Thuy, respectively. Annually, the shoreline retreats 25-29m in Hai Hau and advances 12-23m in Nghia Hung and 37-39m in Xuan Thuy correspondingly. DSAS shows its advantages comparing to traditionally manual shoreline analyses and its promising applications for coastal management purposes in other regions of the country.
