Edy Anto Soentoro
Institut Teknologi Bandung

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Optimization Model of Land Use Planning to Reduce Land Erosion Level: Case Study in the Upper Ciujung River Basin Edy Anto Soentoro; Imam Muhardiono; Yadi Suryadi
Jurnal Teknik Sipil Vol 26 No 3 (2019)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2019.26.3.4

Abstract

AbstractUncontrolled changes in land use located in the upstream river can result in land erosion, which will eventually increase river sedimentation as well as floods, reduce the estimated planned life of the downstream reservoir, and reduce soil productivity due to the loss of nutrients. This study is aimed to find the best land use pattern through optimization, in order to reduce the level of land erosion. The optimization model used is the Linear Programming (LP) method which is combined with the USLE method and Geographic Information System software based on raster grids. The potential sedimentation prediction that is collected from the measurement data in the river is used to calibrate the simulation of the real conditions of land erosion. The optimization results of this study in the Upper Ciujung river basin, Banten, can be obtained by expanding as much as possible the area of corn-fields/moors to become plantations (which are denser and bigger tree fields) or even forests. The results can reduce the level of land erosion by 38.0%, or from 99.03 tons/ha/year to 61.32 tons/ha/year. However, the results above cannot be generally applied in all locations. What can be generally accepted is that the optimization model of this study can be used to reduce the level of land erosion by regulating the size of the area and location of each type of land use, and by considering the factors of soil erodibility, slope, and rain erosivity at the site.AbstrakPerubahan tata guna lahan yang tidak terkendali di daerah hulu aliran sungai dapat mengakibatkan erosi lahan, yang pada akhirnya akan meningkatkan sedimentasi di sungai dan banjir, mengurangi umur rencana waduk di hilirnya, serta menurunkan produktivitas tanah karena lapisan hara yang hilang. Penelitian ini ditujukan untuk mencari pola tata guna lahan yang terbaik dengan cara optimasi guna mengurangi tingkat erosi lahan. Model optimasi yang digunakan adalah metode program linier (LP) yang digabung dengan metode USLE dan software SIG (system informasi geografis) berbasis raster grid. Prediksi potensi sedimentasi dari data pengukuran sedimen di sungai digunakan untuk kalibrasi simulasi kondisi nyata erosi lahan. Hasil optimasi pada penelitian di Sub DAS Ciujung Hulu, Provinsi Banten, bisa didapat dengan merubah seluas mungkin areal ladang/tegalan yang sudah ada untuk menjadi kebun campuran atau hutan. Hasilnya dapat memperkecil tingkat erosi lahan sebesar 38,0%, atau turun dari semula sebesar 99.03 ton/ha/thn menjadi 61,32 ton/ha/thn. Namun hasil tersebut diatas tidak bisa berlaku secara umum di semua lokasi. Yang bisa berlaku umum adalah bahwa model optimasi dari studi ini dapat dipakai untuk mengurangi tingkat erosi lahan dengan mengatur luas areal dan penempatan lokasi jenis-jenis penggunaan lahan, dengan mempertimbangkan faktor erodibilitas tanah, kemiringan lereng, dan erosivitas hujan di lokasi.
Analisis Agradasi, Degradasi dan Sedimentasi di Sungai Pabelan Pasca Erupsi Gunung Merapi 2010 Zeolita Aprilian; Dhemi Harlan; Edy Anto Soentoro; Aulia Zahroni
Journal on Education Vol 5 No 3 (2023): Journal on Education: Volume 5 Nomor 3 Tahun 2023
Publisher : Departement of Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Mount Merapi is the most active volcano in Indonesia, the eruption that occurred in 2010 was a major eruption with a recurrence of once every 100 years. Of the 140 million m3 of potential cold lava of Mount Merapi, 24 million m3 of them flow into the Pabelan River. One of the disaster mitigation on the Pabelan River is the Sabo Dam infrastructure, currently on the Pabelan River there are 23 Sabo Dams, in 2022 an additional 1 Sabo Dam has been built, namely PAC-Menayu. In this study, modeling will be carried out using 1D Kanako before the construction of 1 Sabo Dam and after the construction of 1 Sabo Dam with river geometry from 2020 measurements and flood discharge generated from rainfall triggering debris flow on February 03, 2011 at the Jrakah Rain Post, from this rainfall a 6-hour rain distribution was carried out using the PSA coefficient to be inputted in HEC-HMS. From the results of Kanako modeling, it is concluded that the construction of the new Sabo Dam is able to reduce sedimentation by 52.88 m3 and it is obtained that the construction of 24 Sabo Dams is effective in containing sediment by 32.6% of the total potential for cold lava of 24,000,000 m3 flowing in the Pabelan River so that it is appropriate as a disaster mitigation effort, namely reducing the potential for debris flooding in the future