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All Journal Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian The Indonesian Journal of Planning and Development GEA, Jurnal Pendidikan Geografi Jambura Geoscience Review
Christanto, Nugroho
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Earth & Planetary Sciences Education Environmental Science Social Sciences

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Investigating the Role of Rainfall Variability on the Hydrological Response of Small Tropical Upland Watershed Christanto, Nugroho; Sartohadi, Junun; Setiawan, Anggri; Hadi, M Pramono; Jetten, Victor; Shrestha, Dhruba Phika
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 16, No 1 (2019): January
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v16i1.9879

Abstract

Excessive soil losses found in many upper basins in Java which causing severe problem in the lowland areas due to extreme hydrological response. The objective of this research is to study the role of rainfall variability (spatial variability, intensity and duration) on the hydrological response of small tropical upland watershed. To run and test this scenario, a watershed with a good weather dataset and experience soil loss problem was selected. Therefore, Bompon Watershed were selected to perform the model. In order to investigate the hydrological response of different rainfall variability, LISEM was sed. Three scenarios of comparison were designed: different rainfall interpolation, different direction of rainfall movement, high intensity-short duration and low intensity-long duration rain. Initial moisture content (thetai) was found as the most sensitive variable for all indicators when all input variables value increased. When the input variables values decreased, thetai was found as the most sensitive variable for changing in total discharge, whereas saturated hydraulic conductivity (Ksat) was the most sensitive variable for changing in peak of discharge.
Study of Groundwater Vulnerability to Pollution in the Tambakbayan Watershed in 2006 And 2017 Widyastuti, Margaretha; Suprayogi, Slamet; Hadi, M Pramono; Christanto, Nugroho; Tivianton, Tommy Andryan; Fadilah, Gita Oktaviani; Rahmawati, Laelina
Jurnal Pendidikan Geografi Gea Vol 21, No 1 (2021)
Publisher : Indonesia University of Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/gea.v21i1.28368

Abstract

Tambakbayan is one of the watersheds in Yogyakarta, Indonesia that is experiencing changes in land use. The research aims to analyze the distribution of intrinsic and specific groundwater vulnerability in the watershed that was influenced by land-use changes from 2006 to 2017. The data used are the RBI maps (containinh topographic and land-use information, 2006 and 2017), SRTM imagery, rainfall recorded at the Kambil, Prumpung, Bronggang, Santan, Gemawang, and Karang Ploso stations (2006-2017), soil map, and aquifer map. Land-use change was analyzed by comparing the RBI maps of 2006 and 2017; while the groundwater vulnerability was assessed with the Susceptibility Index a development of the DRASTIC method. The intrinsic groundwater vulnerability was generated based on physical conditions, including depth to the water table, aquifer media, groundwater recharge, and topography, while the specific groundwater vulnerability was a function of these attributes added with one anthropogenic parameter : land-use. Then, all of these parameters were analyzed with map ovelay. The results showed two levels of intrinsic vulnerability : low (2.18% of the watershed area) and medium (97.8%); and three classes of specific vulnerability : low (0.02%), medium (5.06%), and high (94.92%)in 2006. From 2006 through 2017, the areal percentage of the medium vulnerability  increased, while that of the high vulnerability decreased due to the conversion of agricultural land to a reservoir in 2009. 
Impacts of Land Use on Runoff and Sediment Dynamics in Tropical Watersheds: A Case Study in Bogowonto Upper Watershed Christanto, Nugroho; Setiawan, Muhammad Anggri; Kholis, Afid Nur; Sharma, Rahit; Shrestha, Dhruba Pika
Jambura Geoscience Review Vol 6, No 2 (2024): Jambura Geoscience Review (JGEOSREV)
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37905/jgeosrev.v6i2.26055

Abstract

Land use changes in tropical regions have increased, leading to rising environmental stress in Java, Indonesia. Food shortages have driven land conversion and expansion, which increases peak flows during the rainy season and reduces water storage in the dry season, heightening flood risks. Research on integrated catchment hydrology is crucial. This study examines the relationship between land use, runoff, and sediment in the Bogowonto Upper Watershed using SWAT hydrological modeling. The SWAT model helps understand hydrological processes at the watershed scale and the impact of land use changes on runoff and sediment dynamics. The sensitivity of SWAT model parameters varies in the Bogowonto Upper Watershed. Runoff sensitivity analysis indicates a +62% increase with a 50% change in CN value, showing high sensitivity. A 50% change in vegetation cover results in a +50% model output, indicating moderate sensitivity. Slope, Ksat (saturated hydraulic conductivity), and bulk density are fairly sensitive, while AWC is slightly sensitive. For sediment, a 50% increase in CN value results in a +47% change, and a 50% increase in vegetation cover leads to a +58% model output, showing moderate sensitivity. The model, run from 2014-2019, shows excellent accuracy with NSE of 0.82, RRMSE of 0.43, R² of 0.83, and PBIAS of 9.8%.
Urban Flood Management Strategies in Kapanewon Depok, Sleman Regency (A Simulation-Based Study Using EPA SWMM 5.2) Sawitri, Nurin Retno; Christanto, Nugroho; Retnowati, Arry
The Indonesian Journal of Planning and Development Vol 10, No 1 (2025): February 2025
Publisher : Department of Urban and Regional Planning, Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijpd.10.1.27-37

Abstract

Kapanewon Depok has experienced frequent urban flooding in recent years, driven by rapid urbanization and the compounding effects of climate change. In response, the Sleman Regency Government, through the 2023-2043 RDTR for the Central Sleman Area, plans to implement various strategies, including the construction infiltration trenches as a flood mitigation strategy. This study aims to evaluate the strategic role and effectiveness of infiltration trenches in reducing urban flooding in Kapanewon Depok. The EPA SWMM 5.2 software was utilized to simulate urban flooding scenarios using rainfall data with a 5-year return period. The first scenario simulated the current urban drainage system, while the second scenario incorporated Low-Impact Development (LID) controls, specifically infiltration trenches. Results from the initial scenario revealed 30 junctions experiencing overflows. The use of infiltration trenches covering 0.5% of the sub-catchment area served by the overflowing channel, successfully reduced the number of overflow points to 18, with an average reduction of 62.5% and 62% total flood volume and hours flooded, respectively. This study highlights the importance of integrating infiltration trenches into broader flood management strategies, combining structural and non-structural approaches to enhance resilience in urban water management systems. The findings support regional planning by providing actionable recommendations for sustainable flood risk reduction strategies.
Co-Authors Arry Retnowati Fadilah, Gita Oktaviani Junun Sartohadi Kholis, Afid Nur M Pramono Hadi, M Pramono Margaretha Widyastuti Rahmawati, Laelina Sawitri, Nurin Retno Setiawan, Anggri Setiawan, Muhammad Anggri Sharma, Rahit Shrestha, Dhruba Phika Shrestha, Dhruba Pika Slamet Suprayogi Tivianton, Tommy Andryan Victor Jetten, Victor