Application of Remote Sensing and GIS Technology in Mapping Partition Saline Intrusion to Paddy Land: A Case Study at Phu Vang District, Thua Thien Hue Province

Abstract

Adapting and restricting salinity intrusion in Vietnam is being concerned by more researchers as well as the local authorities. This study aimed to use remote sensing and geographic information system (GIS) technology for mapping paddy areas and salinity intrusion in spring crop 2015 at Phu Vang district, thereby helping precondition for assessing and monitoring changes in salinity intrusion to serve for salinization management in study area. Based on acquisition imagery, land use map and normalized difference vegetation index (NDVI) were extracted to interpolate the salinity of area by combining the laboratory analysis of collected soil samples from the field. The result showed that there were 1,067.107 ha of salinity land area accounting for 10.04% of the rice land in Phu Vang district, where the moderate salinity level was 180.67 ha and low salinity level was 866.431 ha. The salinity rice land was mainly distributed in Vinh Ha commune, Phu An commune and Phu Dien commune. The salinity in this area ranged from 0.4 mS/cm to 1.41 mS/cm and the moderate salinity was approximately 0.9 mS/cm. Besides, this research also showed that the salinity (electrical conductivity) and the development of vegetation (NDVI) were closely related with each other up to 61.4%.