THE EFFECT OF LAND USE PATTERNS ON FLOOD VULNERABILITY LEVELS. CASE STUDY: WEST LOMBOK REGENCY, WEST NUSA TENGGARA PROVINCE, INDONESIA

Uncontrolled changes in land use patterns are one of the main factors causing increased levels of flood vulnerability in several areas.To overcome flooding problems, integrated planning is needed related to the suitability of the regional land use plan.However, inconsistencies still often occur in its implementation due to the emergence of various interests.This study aims to analyze the relationship between land conversion into built-up areas and increased flood risk, map the distribution of flood areas, and estimate the level of flood vulnerability.The methods used include spatial analysis, multicriteria analysis, and descriptive analysis using the Hierarchy Process (AHP) and Geographic Information Systems (GIS) applications.The input factors forming flood risk used in the analysis include rainfall intensity (I), slope gradient (S), land use (U), soil type (ST), distance from drainage/river networks (D), and altitude (E).The results of the study indicate that the potential for flood vulnerability in West Lombok Regency consists of a rather vulnerable class spread across all subdistricts, namely an area of 47.624 Ha (51.80%), not vulnerable to an area of 21.001 Ha (22.84%), and 25% of the remaining areas are divided into moderately vulnerable areas of 15.241 Ha (16.58%), vulnerable areas of 7.871 Ha (8.56%), and very vulnerable areas of 195.79 Ha (0.21%).Sustainable land use management is essential to reduce flood vulnerability, especially in areas experiencing rapid development.