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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.
Kajian Sedimentasi di Muara Sungai ciletuh, Kabupaten Sukabumi Yadi Suryadi; Afrizal Maulana Sutrisna; Mohammad Bagus Adityawan; Asrini Chrysanti; Bagus Pramono Yakti; Widyaningtias Widyaningtias; Iwan Kridasantausa Hadihardaja
Jurnal Teknik Sipil Vol 27 No 2 (2020)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2020.27.2.5

Abstract

AbstractFishermen around Ciletuh estuary were having difficult times due to their lack of fish cathments. This happens because of sedimentation on Ciletuh estuary, causing the fishermen unable to moor their boats. Sedimentations in Ciletuh estuary is the accumulation of the sediment transport from Ciletuh river. Therefore, analysis is performed regarding hidrology, tidal, wave and sedimentation. The sedimentation modeling is performed by using Delft3D with 3 conditions: wet season, dry season and flood condition. Concluded that the highest sedimentation happens when flood condition is in return periode of 2 years, with the value of sedimentation reaching 2 meters high.AbstrakNelayan di sekitar muara Sungai Ciletuh mengalami masa sulit akibat hasil tangkapan ikan yang terus berkurang. Hal ini terjadi karena muara Sungai Ciletuh mengalami pendangkalan, mengakibatkan nelayan menjadi kesulitan untuk menambatkan perahu mereka. Sedimentasi yang terjadi di muara Sungai Ciletuh merupakan akumulasi dari angkutan sedimen yang dibawa oleh aliran sungai yang berasal dari erosi di DAS Ciletuh. Oleh karena itu dilakukan analisis hidrologi, pasang surut, gelombang, dan sedimentasi yang terjadi di muara Sungai Ciletuh. Pemodelan menggunakan Delft3D dilakukan dengan tiga kondisi; musim kering, musim basah dan kondisi banjir. Disimpulkan bahwa sedimentasi paling besar yang terjadi di muara Sungai Ciletuh pada saat kondisi banjir dengan periode ulang 2 tahun, dengan nilai sedimentasi mencapai ketinggian 2 meter.
PENGARUH KEBERADAAN BENDUNGAN LEUWIKERIS DAN BENDUNGAN MATENGGENG TERHADAP ALOKASI AIR DAERAH ALIRAN SUNGAI (DAS) CITANDUY Yusanuari Alaniri; Yadi Suryadi
JURNAL SUMBER DAYA AIR Vol 19, No 2 (2023)
Publisher : Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v19i2.857

Abstract

ABSTRACT The Citanduy watershed service area, which is located in Cilacap Regency, Ciamis Regency, Pangandaran Regency and Banjar City, is currently experiencing an increase in population growth, residential facilities, and the number of immigrants, so that the demand for raw water in these areas is increasing. On the other hand, the availability of water in the area is decreasing, so it is necessary to study potential sources of raw water to determine the solutions to be taken in order to meet the demand for raw water supply and develop potential water resources in the study area. The purpose of this study is to simulate water allocation using the WEAP (Water Evaluation And Planning) software in the Citanduy watershed area. In the data analysis section, two water balance simulation scenarios were created based on the various suggestions to be recommended for developing the potential of water resources in the study area. From the two scenarios that were implemented, a recommendation emerged to build a new irrigation area of 18.800 ha, the Leuwikeris Reservoir with a volume of 69,56 million m3 and the Matenggeng Reservoir with a volume of 500 million m3. With the plan to meet these water needs, it is necessary to conduct a feasibility study of water allocation in order to find out how technically feasible both the Citanduy River and the Leuwikeris Dam are in meeting the water needs as previously planned. Given the strategic location of West Java and Central Java Provinces and the many irrigation areas located within them, the need for and demand for water services will continue to increase over time.Keywords : simulation of water allocation, Citanduy watershed, Leuwikeris reservoir, Matenggeng reservoir. ABSTRAKDaerah layanan DAS Citanduy, yang terdapat di Kabupaten Cilacap, Kabupaten Ciamis, Kabupaten Pangandaran  dan Kota Banjar saat ini terus mengalami peningkatan pertumbuhan jumlah penduduk, fasilitas pemukiman, dan jumlah pendatang, sehingga kebutuhan air baku di wilayah tersebut semakin meningkat. Di sisi lain ketersediaan air di wilayah tersebut semakin berkurang, sehingga diperlukan adanya suatu studi potensi sumber air baku untuk menentukan solusi yang akan diambil dalam rangka memenuhi kebutuhan penyediaan air baku dan pengembangan potensi sumber daya air di wilayah studi. Tujuan dari studi ini adalah melakukan simulasi alokasi air dengan menggunakan perangkat lunak WEAP (Water Evaluation And Planning) di wilayah DAS Citanduy. Pada bagian analisis data, dibuat dua skenario simulasi neraca air berdasarkan berbagai usulan yang ingin direkomendasikan untuk mengembangkan potensi sumber daya air di wilayah studi. Dari kedua skenario yang dijalankan, muncul sebuah rekomendasi untuk membangun daerah irigasi baru seluas 18.800 Ha, Waduk Leuwikeris dengan volume 69,56 juta m3 dan Waduk Matenggeng dengan volume 500 juta m3. Dengan rencana pemenuhan kebutuhan air tersebut, maka diperlukan adanya suatu kajian kelayakan alokasi air guna mengetahui seberapa layak secara teknis baik Sungai Citanduy maupun  Bendungan Leuwikeris dalam memenuhi kebutuhan air seperti yang telah direncanakan sebelumnya. Mengingat letak Provinsi Jawa Barat dan Provinsi Jawa Tengah yang cukup strategis serta banyaknya daerah irigasi yang terletak di dalamnya, kebutuhan dan permintaan layanan air akan terus meningkat seiring dengan berjalannya waktu.Kata Kunci:  simulasi alokasi air, DAS Citanduy, waduk Leuwikeris, waduk Matenggeng.
Evaluasi Kapasitas Sungai Kuning dalam Mengalirkan Banjir Lahar Dingin Pasca Erupsi Merapi Tahun 2010 Rizaldi Wisnu Nugroho; Yadi Suryadi; Faizal Immaddudin Wira Rohmat; Ulin Nurul 'Aini
Journal on Education Vol 6 No 2 (2024): Journal on Education: Volume 6 Nomor 2 Tahun 2024
Publisher : Departement of Mathematics Education

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31004/joe.v6i2.4951

Abstract

Indonesia as a country with the largest number of volcanoes in the world, Mount Merapi which is one of the most active. OIne of its largest eruptions recorded in 2010. Kuning River, which originates into Mount Merapi is affected by cold lava flows. In the research region, there are ten sabo dams that function as cold lava controller, supposedly designed with a 100-year return for volcanic areas. This research focuses on the capacity of rivers and sabo dams to cope with cold lava with return period of 2 to 100-year. Hydraulic modeling of cold lava was performed using non-Newtonian 2D HEC-RAS with DEM data from LiDAR in 2012. Results showed the river was able to flow lava floods 2 to 100-year return period without sabo dams. However, in existing conditions with ten sabo dams, there is flood at upstream of Sabo Dam KU-Rejodani starting from the 5-year return period. This has been validated with calculations that are in line with hydraulic simulation results. To increase river capacity, construction of 1.5-meter high embankment upstream of the KU-Rejodani sabo dam proved to be an effective solution, to increase river capacity up to Q100. This effort supports mitigation for cold lava disaster.
PENGARUH KEBERADAAN BENDUNGAN LEUWIKERIS DAN BENDUNGAN MATENGGENG TERHADAP ALOKASI AIR DAERAH ALIRAN SUNGAI (DAS) CITANDUY Yusanuari Alaniri; Yadi Suryadi
JURNAL SUMBER DAYA AIR Vol 19, No 2 (2023)
Publisher : Direktorat Bina Teknik Sumber Daya Air, Kementerian Pekerjaan Umum dan Perumahan Rakyat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32679/jsda.v19i2.857

Abstract

 The Citanduy watershed service area, which is located in Cilacap Regency, Ciamis Regency, Pangandaran Regency and Banjar City, is currently experiencing an increase in population growth, residential facilities, and the number of immigrants, so that the demand for raw water in these areas is increasing. On the other hand, the availability of water in the area is decreasing, so it is necessary to study potential sources of raw water to determine the solutions to be taken in order to meet the demand for raw water supply and develop potential water resources in the study area. The purpose of this study is to simulate water allocation using the WEAP (Water Evaluation And Planning) software in the Citanduy watershed area. In the data analysis section, two water balance simulation scenarios were created based on the various suggestions to be recommended for developing the potential of water resources in the study area. From the two scenarios that were implemented, a recommendation emerged to build a new irrigation area of 18.800 ha, the Leuwikeris Reservoir with a volume of 69,56 million m3 and the Matenggeng Reservoir with a volume of 500 million m3. With the plan to meet these water needs, it is necessary to conduct a feasibility study of water allocation in order to find out how technically feasible both the Citanduy River and the Leuwikeris Dam are in meeting the water needs as previously planned. Given the strategic location of West Java and Central Java Provinces and the many irrigation areas located within them, the need for and demand for water services will continue to increase over time.Keywords : simulation of water allocation, Citanduy watershed, Leuwikeris reservoir, Matenggeng reservoir.