Impact of Tidal River Management (TRM) for Water Logging: A Geospatial Case Study on Coastal Zone of Bangladesh

Abstract

Bangladesh is a floodplain dominated country. Coastal delta areas of Bangladesh convey multiple impacts of climate change worth-hit. Most of the rivers carry a huge amount of sediment from upstream piedmont area. The river bed rises due to insufficient upstream water supply. Similarly, the deposited sedimentation creates a large number of sandbars inside the river. That's why, water logging and siltation turn into a serious problem in the southwestern region of Bangladesh, especially in Satkhira, Khulna and Jessore district. In the middle of September, 2011 the Tidal River Management (TRM) project approved at the study site for four years to develop the water logging problem with basic consideration of silt management. In this circumstance, this study focused on the consequences of the TRM on water logging in the coastal area of Bangladesh. Primary and secondary data have been used. Geospatial analyses have been used following the NDWI in Arc GIS for water logging area detestation using Landsat Enhance Thematic Mapper (ETM) and Landsat Operational land Image (OLI) satellite images. The geo-spatial analysis denoted, about 5090 acres of agricultural land and about 729 acres of homestead land have been water logged during TRM implementation period.

Sustainability of the coastal zone of the Ganges-Brahmaputra-Meghna delta under climatic and anthropogenic stresses

“…Moreover, it is not possible to return back to the delta's natural state because the infrastructures are now an essential component to the local people in protecting their land from flooding and salinity intrusion (Rahman et al, 2021). The technical insights of the locally adaptive indigenous methods have already been clarified through a number of research projects (Hussain et al, 2018;Adnan et al, 2020;Rahman et al, 2004;Zhang et al, 2010;Kibriya, 2020) and some of the above methods (Fig. 6) have been tested for sediment management purposes in the south-west region of Bangladesh in isolation and have shown mixed experiences of failures/successes with emerging socio-technical challenges (Hussain et al, 2018;Adnan et al, 2020).…”

“…The technical insights of the locally adaptive indigenous methods have already been clarified through a number of research projects (Hussain et al, 2018;Adnan et al, 2020;Rahman et al, 2004;Zhang et al, 2010;Kibriya, 2020) and some of the above methods (Fig. 6) have been tested for sediment management purposes in the south-west region of Bangladesh in isolation and have shown mixed experiences of failures/successes with emerging socio-technical challenges (Hussain et al, 2018;Adnan et al, 2020). For any specific sediment management practice or combination of different practices, local impacts often extend outside the domains under investigation and the entire system needs to be considered in an integrated way using a single modelling framework with continuous feedback of data (Bangladesh Delta Model, WARPO and BUET, 2020;WARPO and BUET, 2021) to enable understanding of the system response to the implemented options.…”