Flood susceptibility analysis to sustainable development using MCDA and support vector machine models by GIS in the selected area of the Teesta River floodplain, Bangladesh

Abstract

Managing flood risks to ensure sustainable development, this research analyses the flood susceptibility in the selected area of the Teesta River floodplain in Bangladesh using the MCDA model with the SVM model. The different geological and climatic flood vulnerability factors used in this study were collected from USGS, BMD, BARC, BWDB, and BBS. This study reveals that the channel pattern changed, drainage density decreased by 42.28 %, and TWI became high during the study period (2000−2020). This study shows that the very high, high, and medium flood-susceptible zones increased by 5.66 %, 2.7 %, and 7.74 %, and the low-risk zone decreased by 10.79 % during the study period. The drainage system was found to be a significant flood conditioning factor, and the waterbody and river area decreased by 5.31 %. From the flood inventory prediction rate curve analysis 70 % of validation points agreed with field data. According to AUC, the average success rate is 91.51 %.