Assessment of soil-water vulnerability to salinization in Ben Tre province using DRASTIC model

Le Ngoc Thanh; Van Tuyet Dao; Van Tan Lam; Quang Dung Nguyen; Hai Tung Luu

doi:10.15625/1859-3097/18227

Author affiliations

Authors

Le Ngoc Thanh Ho Chi Minh City Institute of Resources Geography, VAST, Vietnam; Thuy Loi University - Southern Campus, Ho Chi Minh City, Vietnam
Dao Van Tuyet Department of Management of Scientific Research and External Relations, Binh Duong University, Binh Duong, Vietnam
Lam Van Tan Institute of Applied Technology and Sustainable Development, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
Nguyen Quang Dung Ho Chi Minh City Institute of Resources Geography, VAST, Vietnam
Luu Hai Tung Ho Chi Minh City Institute of Resources Geography, VAST, Vietnam

DOI:

https://doi.org/10.15625/1859-3097/18227

Abstract

Soil water in the coastal zones is more vulnerable to salinization. Soil-water vulnerability assessment is an effective tool for soil-water management. This study used the DRASTIC model, which is based on seven factors viz: depth to soil water, recharge, soil-water bearing layer, soil media, topography, impact of root zone, and hydraulic conductivity to evaluate soil-water salinization potentiality of Ben Tre province. The obtained soil-water vulnerability map is divided into three vulnerable zones: low vulnerability zone with 348.59 km² of total area, moderate vulnerability zone with 1898.77 km², and high vulnerability zone having 147.64 km². Moreover, the DRASTIC model was validated by Total dissolved solids (TDS) over the study area. Validation results showed the low vulnerability zone of the moderate saline (TDS = 1,500–7,000 mg/L), while the moderate vulnerability zone of the moderate, high, and very high saline (TDS = 1,500–35,000 mg/L). However, the high vulnerability zone has a very high saline (TDS = 15,000–35,000 mg/L). The study results are of considerable value to land use planning and soil researchers.

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