386 / 2024-03-08 10:37:33

AN APPLICATION OF SENTINEL - 2 FOR MAPPING AND MONITORING OF SOIL SALINITY A CASE STUDY IN TRA VINH PROVINCE, VIETNAM

Sentinel-2,Google Earth Engine（GEE）,salinity

Subtheme 1: Water-related Hazard and Risk Reduction > Topic 2: Simulation and Forecast of Water Hazard

Salinity intrusion is an signifiant challenge for agriculture and freshwater resources in the region, especially in the context of climate change and human activities. Tra Vinh province, located in Vietnam's Mekong Delta, is one of the areas facing serious salinity intrusion problems. Saltwater intrusion occurs when seawater, which contains more salt, enters freshwater sources on land. This causes saltwater intrusion, causing great damage to agriculture, clean water supply systems, and community life, especially in Tra Vinh province, where agriculture and freshwater resources play an important role, this study calculated saline intrusion indicators based on multi-layer, multi-resolution, multi-time remote sensing technology for Tra Vinh, Vietnam. The research using Google Earth Engine cloud computing technology, to calculate 9 include: 5 of Salinity index (SI1, SI2, SI3, SI4, SI5), Brightness index (BI), Normalized difference salinity index (NDSI), Vegetation soil salinity index (VSSI), Normalized differential vegetation index (NDVI), Soil adjusted vegetation index (SAVI) in the period December 2021 to April 2022 (in Tra Vinh’ s dry season) from Sentinel 2. The results show that the SI1 index is in the range of 1229.9 to 8366.8; SI2 index is in the range of 857.7 to 5912.4; SI3 index is in the range of 803.8 to 5966.3; SI4 index is in the range of 830.8 to 9682.6; SI5 index is in the range of 0.589 to 1.56; NDSI index ranges from -0.63 to 0.25; VSSI index ranges from -46609.13 to -8183.5; NDVI index ranges from -0.248 to 0.63; SAVI index ranges from 1655.46 to 17438.8. This research has the potential to provide valuable informations for water resources management and sustainable agricultural development in Tra Vinh province, Vietnam while also contributing to efforts to respond to climate change in this area.