Author/s:

Hasan, M.
Haque, A.
Hossain, T.
Rahman, M.

Publisher:

ResearchGate

Year of Publication:

2019

ABSTRACT

The coastal zone of Bangladesh covers about 20% of total land of the country and over 30% of the cultivable lands. According to the National Adaptation Program of Action (NAPA), water related hazards due to climate change are likely to become a critical issue for Bangladesh. Salinity in surface water, ground water and soil has become a dominant hazard in Bangladesh coastal zone. There are number of studies in the region that address surface water and ground water salinity. But very few studies deal with soil salinity. There is not study in the region that particularly deals with the soil salinity hazard assessment. This study is aimed to fill this research gap. In this study, soil salinity hazard is assessed by using historical secondary data related to area affected by soil salinity. By using normalization method, soil salinity hazard map is prepared in GIS environment. The results show that western region is very high saline zone and eastern region is low saline zone in terms of soil salinity. This study tries to find out the saline affected area from 1973 to 2009 and also tries to give a salinity risk map in the southern part of Bangladesh. Amount of saline affected area is considered as the parameter and by normalizing the amount of affected areas the salinity risk maps are prepared. About 0.223 million ha (26.7%) new land is affected by various degrees of salinity during the last four decades. The maximum saline affected area is found at Galachipara Upazila in Patuakhali District while the minimum saline affected area is found at Maladi Upazila in Barisal district. The saline affected areas are increased in Khulna, Bagerhat, Satkhira, Patuakhali districts. From the risk map it is identified that the lower middle and the corner of the southern part of Bangladesh fall at the zone of high and very high risk.

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