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All Journal Jurnal Ilmu Lingkungan Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Majalah Geografi Indonesia Geosfera Indonesia
Christanto, Nugroho
Departement Geografi Lingkungan, Fakultas Geografi, Universitas Gadjah Mada
Earth & Planetary Sciences Environmental Science Social Sciences

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INVESTIGATING THE EFFECT OF CONSERVATION TECHNIQUES ON THE LAND DEGRADATION OF TROPICAL CATCHMENT PRONE TO LANDSLIDE Christanto, Nugroho; Sartohadi, Junun; Setiawan, Muhammad Anggri; Hadi, M Pramono; Jetten, Victor G; Shrestha, Druba Phika
Jurnal Geografi : Media Informasi Pengembangan dan Profesi Kegeografian Vol 14, No 2 (2017): July 2017
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/jg.v14i2.11513

Abstract

Land degradation in Serayu watershed is a major concern in central Java and in Indonesia. As part of a broader effort to develop a land degradation assessment tool in tropical area, this study implemented a process-based watershed hydrology to assess the effect of conservation technique upon land degradation by using PCRaster. STARWARS was used to assess the watershed hydrology in the area based on their land use/ land cover, soil, and slope profiles. The results from STARWARS were used as inputs for the PROBSTAB model to simulate the slope stability in the area. DEM scenario were used, they are with terraces and without terraces.The models show that the landuse practice in the study area work like two edges of sword. The promoting of bench terrace can be reducing the risk of soil erosion but in the other hands it increases in the risk of landslide. From the slope-stability modeling, we can see that the terrace increases the pore-water pressure significantly which lead to the ideal conditions for the failures. The extremely high intensity rainfall, in the other hands, may build a sharp increase of pore-water pressure. The increasing probability of failure might cause the soil erosion even worse. Therefore, in order to make the terrace practice is effective to control the land degradation process; the terrace has to be well maintained.
Analisis Laju Sedimen DAS Serayu Hulu dengan Menggunakan Model SWAT Nugroho Christanto; Muhammad Anggri Setiawan; Afid Nurkholis; Saidah Istiqomah; Junun Sartohadi; M Pramono Hadi
Majalah Geografi Indonesia Vol 32, No 1 (2018): Majalah Geografi Indonesia
Publisher : Fakultas Geografi, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3251.047 KB) | DOI: 10.22146/mgi.32280

Abstract

Wilayah DAS Serayu Hulu merupakan DAS prioritas yang memerlukan langkah pengelolaan yang komprehensif. Aplikasi model Soil and Water Assessment Tool (SWAT) dapat digunakan sebagai media untuk  perencanaan konservasi ataupun evaluasi respon DAS (debit aliran permukaan, sedimen dan pencemaran sungai). Tujuan utama dari penelitian ini adalah menjalankan model SWAT di DAS Serayu Hulu untuk mengetahui laju sedimen di wilayah ini. Pemodelan SWAT membutuhkan sejumlah input parameter berupa relief, tanah, tutupan lahan dan pengelolaan lahan. Pedogeomorfologi digunakan sebagai batas satuan tanah karena tidak tersedianya peta tanah di wilayah penelitian. Hasil Penerapan model SWAT di DAS Serayu Hulu menghasilkan nilai yang cukup memuaskan, hal ini ditunjukkan nilai R2 mencapai 0,94. Hasil pemodelan SWAT dengan menggunakan data selama 10 tahun (2004-2013) menunjukkan bahwa DAS Serayu Hulu memiliki rerata hasil sedimen sebesar 1.926.900 ton/tahun. Sub DAS 8,9 11, 17, 18, dan 19 merupakan penghasil sedimen tertinggi di DAS Serayu Hulu dengan hasil sedimen 43.931– 121.434 ton/ha/tahun.
Runoff Coefficient Analysis After Regional Development in Tambakbayan Watershed, Yogyakarta, Indonesia Slamet Suprayogi; M Widyastuti; M Pramono Hadi; Nugroho Christanto; Tommy Andryan Tivianton; Gita Oktaviani Fadhilah; Laelina Rahmawati; Lintang Nur Fadlillah
Jurnal Ilmu Lingkungan Vol 20, No 2 (2022): April 2022
Publisher : School of Postgraduate Studies, Diponegoro Univer

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jil.20.2.396-405

Abstract

The Tambakbayan Watershed has experienced changes in its land utilization. Based on land-use data from 2006 and 2017, built-up land was found to have encroached on vegetated areas and showed a substantial increase in area. Such conversion can alter and modify runoff coefficients, as a measure of watershed response. This research aimed to evaluate land-use change in the watershed from 2006 through 2017 and its effects on runoff coefficients. It used descriptive quantitative methods combining literature study and data calculation. The secondary data were obtained from digital land-use maps (RBI) in 2006 and 2017, SRTM images, soil types, and the drainage network of the watershed. Runoff coefficient analysis confirmed that the land-use change between 2006 and 2017 caused by regional development increased the runoff coefficients of the watershed observed.ABSTRAKDaerah Aliran Sungai Tambakbayan telah terjadi perubahan, berdasarkan data penggunaan lahan tahun 2006 dan tahun 2017. Perubahan yang terjadi berupa meningkatnya lahan terbangun dan berkurangnya lahan bervegetasi. Perubahan penggunaan lahan yang terjadi dapat mengakibatkan perubahan respon DAS yang dikuantifikasikan dalam bentuk koefisien aliran. Tujuan penelitian adalah mengevaluasi perubahan penggunaan lahan daerah penelitian dari tahun 2006 dan 2017, kaitannya dengan koefisien aliran. Metode yang digunakan adalah deskriptif kuantitatif berdasarkan studi pustaka dan perhitungan. Data sekunder yang digunakan adalah Peta Rupa Bumi Digital Indonesia Tahun 2006 dan 2017, Citra SRTM DAS Tambakbayan, Jenis Tanah DAS Tambakbayan, dan Jaringan Drainase DAS Tambakbayan. Perubahan penggunaan lahan akibat perkembangan wilayah, mengakibatkan peningkatan koefisien aliran pada tahun 2017 apabila dibandingkan dengan koefisien aliran pada tahun 2006.
Sediment Flow Characteristics in The Upper Slope of Volcanic Landscapes With Dryland Agriculture La Ode Hadini; Junun Sartohadi; M. Anggri Setiawan; Djati Mardiatno; Nugroho Christanto
Geosfera Indonesia Vol 6 No 3 (2021): GEOSFERA INDONESIA
Publisher : Department of Geography Education, University of Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/geosi.v6i3.24480

Abstract

Increasing population densities and food demands are major factors contributing to the widespread use of agricultural drylands in upper volcanic slope areas. This phenomenon poses a high risk of severe erosional events that are environmentally hazardous. Therefore, this study aims to analyze the sediment flow characteristics, based on the relationship between sediment flow and water level as well as the sediment discharge rate and soil loss. Field surveys were conducted to determine the soil measurement, slope morphology and dryland cover characteristics. The sediment flow was evaluated at the gully outlet, where 169 suspension data pairs for the modeling and 130 suspension data pairs for the validation, as well as the bed load, water level, rainfall and water flow characteristics were obtained. Tables and figures were subsequently used to represent the measurement data and analysis results for the correlation between the flow rate effects, sediment and soil loss on the water surface. The results showed that the sediment flow in volcanic landscape slopes with dryland agriculture were possibly characterized by the polynomial relationship, using the suspension discharge model, Qs=0.0322Q2+6.0625Q–1.2658. Under this condition, the average rate of soil loss in the form of sediment load and erosion rate of the catchment area occurred at 953.53 and ​​1,657.94 ton/ha/yr, respectively. Furthermore, the sediment sources in the soil loss were believed to originate from 83% of the suspended sediments and 17% bed loads. Keywords: Discharge; Dryland; Landscape; Sediment; Volcano Copyright (c) 2021 Geosfera Indonesia and Department of Geography Education, University of Jember This work is licensed under a Creative Commons Attribution-Share A like 4.0 International License
Co-Authors Afid Nurkholis Djati Mardiatno Gita Oktaviani Fadhilah Hadini, La Ode Jetten, Victor G Junun Sartohadi Laelina Rahmawati Lintang Nur Fadlillah M Pramono Hadi M Pramono Hadi, M Pramono M Widyastuti M. Anggri Setiawan Mohammad Pramono Hadi Muhammad Anggri Setiawan Saidah Istiqomah Setiawan, Muhammad Anggri Shrestha, Druba Phika Slamet Suprayogi Tommy Andryan Tivianton