GeoEco
Vol 9, No 1 (2023): GeoEco January 2023

MORPHOMETRY ANALYSIS OF SILAT SUB-WATERSHED BASED ON GEOSPATIAL TECHNOLOGY IN THE SILAT HULU SUB DISTRICT

Nurul Ramdhania (IKIP PGRI Pontianak)
Ayu Rianingsih (Department of Geography Education IKIP PGRI Pontianak)
Holifah Nurfitri (Department of Geography Education IKIP PGRI Pontianak)
Ajun Purwanto (Department of Geography Education IKIP PGRI Pontianak)
Dony Andrasmoro (Department of Geography Education IKIP PGRI Pontianak)
Eviliyanto Eviliyanto (Department of Geography Education IKIP PGRI Pontianak)
Francista Francista (Department of Geography Education IKIP PGRI Pontianak)
Florensia Rentia (Department of Geography Education IKIP PGRI Pontianak)



Article Info

Publish Date
29 Nov 2023

Abstract

This study aims to obtain morphometric data from the Silat sub-watershed. The method used is a survey and interpretation of secondary data. Secondary data is taken from Remote Sensing Images, Topographic Maps, and Administration maps. The morphometric data taken were the area, shape, circumstance, river length, river order, height, and drainage density. Data analysis using the Spatial Analyst Tool, namely Hydrology, Map Algebra, and Density tools from ArcGis 10.8. Based on the research results, it is known that the Silat watershed has an area of 466 km², a circumference of 147 km, and a river length of 51 km. The shape of the Silat watershed is elongated because the Circularity Ratio value is 0.27 (<0.5), and the Elongation Ratio value is 5.14 (round). The order of the river network is up to order 6, with a branching index (Rb) of order 1 = 2.03; 2nd order = 2.09; 3rd order = 1.75; 4th order = 1.84; and 5th order = 0.96. The Weighted Average Branching Index (WRb) was 2.73 (<3). The Silat sub-watershed has a height of 32 - 255 meters above sea level. Low river density, dendritic river flow pattern. 

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Journal Info

Abbrev

GeoEco

Publisher

Subject

Earth & Planetary Sciences Education Environmental Science Social Sciences

Description

GeoEco is a journal covering all fields of education and science related to geography and the environment. The purpose of writing this journal are to reveal facts, problems and problem solving that can be used as input for Government, institutions, society and individual.The subject matter of the ...