Detecting the Surface Water Area in Cirata Dam Upstream Citarum Using a Water Index From Sentinel-2

Abstract

This paper describes the detection of the surface water area in Cirata dam, upstream Citarum, using a water index derived from Sentinel-2. MSI Level 1C (MSIL1C) data from 16 November 2018 were extracted into a water index such as the NDWI (Normalized Difference Water Index) model of Gao (1996), McFeeters (1996), Roger and Kearney (2004), and Xu (2006). Water index were analyzed based on the presence of several objects (water, vegetation, soil, and built-up). The research resulted in the ability of each water index to separate water and non-water objects. The results conclude that the NDWI of McFeeters (1996) derived from Sentinel-2 MSI showed the best results in detecting the surface water area of the reservoir.

Utilizing Satellite Imagery for Seasonal Trophic Analysis in the Freshwater Reservoir

“…This research is located in the Cirata Reservoir, West Java, Indonesia. Cirata Reservoir is one of 3 (three) artificial lakes in the Citarum River cascades besides Jatiluhur and Saguling, which has 6,200 ha area with an active volume reaching 796 million m 3 [21] [22]. Based on the Regional Regulation of West Java Province 39/2000, the Cirata Reservoir designation of groups C and D whose water quality must always be meet for fisheries, livestock, agriculture, urban businesses, industry, and hydropower [23].…”

“…Despite the importance of monitoring pollution outbreaks, there is currently a lack of studies that provide seasonal trophic analysis using remote sensing data for Cirata Reservoir [19]. Other research using remote sensing imagery in Indonesia is limited to observing TSS [20], water bodies dynamics [21], also changes in DO, BOD and pH [22]. This study differs from previous research as it focuses on analyzing the seasonal trophic status of the freshwater reservoir using remote sensing data.…”