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All Journal Jurnal Geografi LIngkungan Tropik (Journal of Geography of Tropical Environments)
Rustanto, Andry
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Earth & Planetary Sciences

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DINAMIKA EROSI TANAH DAN KRISIS EKONOMI-ERA REFORMASI DI DAERAH ALIRAN SUNGAI SERAYU HULU Rustanto, Andry
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 3, No. 1
Publisher : UI Scholars Hub

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A large-scale horticulture crops practices in addition to land use / land cover changes in the upper Serayu Hulu catchment has been reported as the most responsible factor of the sedimentation acceleration in the downstream hydropower plant reservoir. This acceleration may become a serious problem for the hydropower plant because it would shorten the reservoir lifespan from the initial estimation. The problem could be further worst if the soil conservation practices application is still limited and land use / land cover changes that tend to increase run-off keep on progress. One of such situation in contrast has been occurred during 1997 - 1998 when financial crisis hit the country followed by the succession of the political regime. Due to the above situation, land use / land cover changes in the period expanded into higher elevation and slope. On the other hand, financial crisis has limited the attention of the horticulture crop farmers in applying soil conservation practices. This paper shows that those two factors together with climatic condition have increase the soil detachment in the hillslope before and after the country financial crisis and political regime succession in 1997 – 1998 by more than 100%. However, the soil detachment rate was then decreasing after some years even though still higher than before 1997
Spatial Pattern Analysis of Agricultural Drought in the Jatiluhur Reservoir’s Irrigation Area Using Normalized Drought Index (NDDI) MODIS Satellite Image Zubair, Ahmad; Sakina, N C; Khairunnisa, N; Siddiq, Ayyasy; Rustanto, Andry; Zulkarnain, Faris; Dimyati, Muhammad
Jurnal Geografi Lingkungan Tropik (Journal of Geography of Tropical Environments) Vol. 6, No. 1
Publisher : UI Scholars Hub

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Agricultural drought occurs in various irrigation areas in Indonesia, one of which is the Jatiluhur Reservoir’s irrigation area. Agricultural drought in this area occurs due to several factors, including the natural phenomenon of climate anomalies which causes the length of the dry season, and also due to less optimal irrigation networks, damaged networks and other obstacles. But, not all agricultural land in the irrigated area experiences drought. Agricultural land affected by drought is important to know its spatial and temporal distribution to determine priority locations in drought disaster management, especially on agricultural land. Therefore, this study aims to examine the spatial pattern of agricultural drought in the irrigation area of the Jatiluhur Reservoir from 2000–2020. The index used in this study is the Normalized Difference Drought Index (NDDI). MODIS image version MOD13Q1 is used by dividing the dryness class into three classifications, namely dry (>0.5), rather dry (0-0.5), and normal (<0.5). The results showed that the most extensive drought in rice paddy fields occurred in 2015 with a dry index of 8574.19 Hectares. Meanwhile, agricultural drought in this area occurs on average from June to September, especially in the Jayalaksana Village and Setialaksana Village, Bungin Sub-District, Bekasi Regency. These two villages are affected by agricultural drought every single year. The spatial pattern of agricultural drought shows that it follows the pattern of the irrigation network. It is necessary to investigate the correlation between agricultural drought and irrigation network in the next research.
Co-Authors Khairunnisa, N Muhammad Dimyati Sakina, N C Siddiq, Ayyasy Zubair, Ahmad Zulkarnain, Faris