Quantitative Morphometric Characteristics in the Geomorphic Setting of Southern Malang, Indonesia

Geomorphometry serves as a vital tool for providing quantitative data on watershed characteristics. Morphometric analysis is essential for understanding the relationship between landform features and hydrological responses. This research aimed to examine geomorphic characteristicnahs in the South Malang area. The methodology involved utilizing remote sensing data through a morphometric approach. Data collection utilized DEMNAS with 8-meter spatial resolution and field observations. Processing was conducted using ArcGIS 10.8, incorporating geomorphometric parameters including hydrological morphometric categories with 12 derived parameters and morphological morphometric categories with 16 derived parameters. The Wang and Liu fill algorithm was implemented for its benefits in filling depressions from edges to center while preserving original topographic integrity. Hydrological processing followed Strahler’s formula for river order determination. Results indicate that the Gurah Watershed exhibits elongated basin morphometric characteristics. This configuration affects complex geomorphological process dynamics. The watershed’s elongated morphometry combined with steep gradients and intermediate geomorphic development suggests potential landslide vulnerability from stream bank erosion. The elongated shape influences hydrological response patterns, causing slower downstream flow arrival and concentrating water flow in the main channel. These conditions are demonstrated through quantitative analysis of hydrological and morphological morphometric categories, providing insights into watershed behavior and potential hazards.