Flood Vulnerability Analysis of The Bengawan Solo Watershed with Overlay Method in Sukoharjo Regency, Central Java Province: The Utilization of Mass Media to Flood Reporting

Fauzi Salam, Izzan Muhammad Nuha, Menliman Joyfal Gulo

Abstract


This study is aiming to (1) provide mapping spatial area of the flood vulnerability and (2) analysis regarding level the flood vulnerability in Sukoharjo Regency, Central Java with accuracy assessment, (3) mapping the frequency of flood from by mass media report. The method used is an overlay analysis with a scoring every variable. The main software utilized is ArcMap 10.82. The base map data used is the Indonesian Topographic Map at a 1:25.000 scale, supplemented by secondary data such as rainfall, soil types, slope gradient, elevation, land use, and river buffer zones. Data were obtained from various government institution and previous research. Slope gradient and elevation were derived from processed Digital Elevation Model (DEM) data, while soil types were obtained from GeoMap. River buffer zones were obtained from data provided by Ina-Geoportal and manual geospatial processing. Land use data were also sourced from Ina-Geoportal. The scoring process refers to previous research.  The results of this study are as follows: flood vulnerability mapping classified 31% of Sukoharjo Regency as high, 37% as moderate, and 32% as low vulnerability, with Sukoharjo, Mojolaban, and Grogol sub-districts exhibiting the greatest at-risk areas. Accuracy assessment against 16 historical flood locations yielded a precision of 75%, recall of 65%, F₁-score of 72.9%, and overall accuracy of 75%.


Keywords


Bengawan Solo; Watershed; Overlay & Scoring; Flood Vulnerability Map; Mass Media; Sukoharjo

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DOI: https://doi.org/10.17509/gea.v25i2.74550

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