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JURNAL SUMBER DAYA AIR
Published by Puslitbang Sumber Daya Air
ISSN : 19070276     EISSN : 2548494X     DOI : -
Core Subject : Engineering,
Civil Engineering, Building, Construction & Architecture Engineering
Jurnal Sumber Daya Air (JSDA) is a journal aims to be a peer-reviewed platform and an authoritative source of information. We publish original research papers, review articles and case studies focused on Water, and Water resources as well as related topics. All papers are peer-reviewed by at least two referees. JSDA is managed to be issued twice in every volume. The Scope of JSDA is: the fields of irrigation, environmental quality and water, swamp, beach, water building, water supply, hydrology and geotechnical fields, hydrology and water management, water environment, coastal fields, fields of cultivation and sabo fields.
Arjuna Subject : -
Articles 10 Documents
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Search results for , issue "Vol 19, No 2 (2023)" : 10 Documents clear
RESPON MODEL HBV DAN MODEL TANGKI TERHADAP ESTIMASI DEBIT ALIRAN DI DAS BOGOWONTO, JAWA TENGAH Fitri Yusti Andini; Bambang Dwi Dasanto; I Putu Santikayasa
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.v19i2.830

Abstract

ABSTRACT The scarcity of discharge data compared to rainfall data have driven the development of the rainfall-runoff model, such as the HBV and Tank models. This research aims to apply the rainfall-runoff model in the Bogowonto watershed and to assess the model outputs. The research consisted of two main stages: 1) model calibration and validation; 2) model evaluation which assesses the model performance based on the Nash-Sutcliffe Efficiency (NSE) index and the coefficient of determination (R2). The results showed that the pattern of the simulation discharge was in accordance with the observed discharge pattern; indicating performance of both models was good (NSE > 0.7 and R2 > 0.65). However, the performance of both models in the daily simulation, particularly at the beginning of the simulation period, is still not satisfactory as the simulated discharge does not match the observed discharge. In the next simulation period, the discharge of the model results were in accordance with the observed discharge; this means the performance of the model was better. In the monthly simulation, the performance of both models is not yet satisfactory during the wet season, but it is good during the dry season. Based on the results of the daily and monthly simulations, both models demonstrate good performance under low precipitation conditions, but their performance declines under high precipitation conditionsKeywords:       Bogowonto watershed; HBV; rainfall-runoff model; simulation; tank ABSTRAKKelangkaan data debit dibandingkan data curah hujan memacu perkembangan model hujan-limpasan, seperti model HBV dan model Tangki. Tujuan penelitian ini adalah menerapkan model hujan-limpasan pada DAS Bogowonto dan menilai luaran hasil model tersebut. Penelitian ini terdiri dari dua tahap. Tahap pertama adalah kalibrasi dan validasi model. Tahap kedua mengevaluasi model, yaitu menilai kinerja model berdasarkan status indeks NSE dan nilai koefisien determinasi. Hasil penelitian menunjukkan bahwa secara umum pola debit simulasi telah sesuai dengan pola debit observasi, ini berarti kinerja kedua model adalah baik (NSE > 0,7 dan R2 > 0,65). Namun, kinerja kedua model dalam simulasi harian, khususnya pada waktu awal simulasi, masih belum baik karena debit simulasi tidak sesuai dengan debit observasi.  Pada periode simulasi selanjutnya, debit hasil model telah sesuai dengan debit observasi; artinya, kinerja model telah semakin baik. Dalam simulasi bulanan, saat musim basah kinerja kedua model masih belum baik tetapi saat musim kering kinerja kedua model menunjukkan hasil yang baik. Berdasarkan hasil simulasi harian dan bulanan, kedua model menunjukkan kinerja yang baik saat hujan rendah tetapi saat hujan tinggi kinerja model mengalami penurunan.Kata Kunci:             DAS Bogowonto; HBV; model hujan-limpasan; simulasi; tangki
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.
KOMBINASI PREDIKSI VOLUME SEDIMEN MENGGUNAKAN METODE HECRAS-USLE UNTUK MENDUKUNG KONSERVASI DAS LAMBIDARO PALEMBANG, SUMATERA SELATAN Masri nur Sultan; Mohammad Farid; Adi Prasetyo; Muhammad Syahril Badri Kusuma; Dantje Kardana Natakusumah
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.v19i2.851

Abstract

ABSTRACT Over the past ten years, flooding has been the most frequent problem in South Sumatra Province, Indonesia. As the capital of South Sumatra Province, Palembang City faces similar problems, where Lambidaro Watershed is the watershed with the highest 25-year potential flood discharge in Palembang City. One of the causes of flooding is the lack of river channel capacity related to land erosion in the watershed. This study aims to learn the prediction of sediment volume and efforts to reduce it in the Lambidaro watershed, Palembang City. This study uses two types of modeling, namely numerical models and empirical models. The numerical model uses the HEC-RAS 6.3.1 application, while the empirical model uses the USLE and SDR equations. The input parameters of the numerical model use some data derived from field measurements. The sediment concentration and observation discharge parameters were measured three times in September 2022. The grain size distribution parameters were sampled at three locations each once in August 2022, and the cohesive parameter was sampled at one location twice in August 2022. The result of the prediction of sediment volume by the numerical model is 1,421.86 m3/year. In contrast, the result of the prediction by the empirical model is 476,941.25 m3/year. Efforts to reduce the prediction of sediment volume USLE method are in the form of applying the intercropping method. The results of the conservation study show that the efforts made can reduce the volume of sediment by 17%.Keywords:       sediment, flood, conservation, intercropping, Lambidaro,  ABSTRAKSelama sepuluh tahun terakhir, banjir telah menjadi masalah yang paling sering terjadi di Provinsi Sumatera Selatan Indonesia. Sebagai ibu kota provinsi Sumatera Selatan, kota Palembang menghadapi masalah serupa. dimana DAS Lambidaro adalah DAS dengan potensi debit banjir kala ulang 25 tahun tertinggi di kota Palembang. Salah satu penyebab banjir adalah penurunan kapasitas alur sungai yang berkaitan dengan erosi lahan di DAS. Penelitian ini bertujuan untuk melakukan kajian prediksi volume sedimen serta upaya pengurangannya di DAS Lambidaro. Penelitian ini menggunakan dua jenis pemodelan yaitu model numerik dan model empirik. Model numerik menggunakan aplikasi HEC-RAS 6.3.1 sedangkan model empirik menggunakan persamaan USLE dan SDR. Parameter input dari model numerik menggunakan beberapa data yang berasal dari pengukuran lapangan. Parameter konsentrasi sedimen dan debit sesaat diukur sebanyak tiga kali pada bulan September tahun 2022. Parameter gradasi butiran diambil sampelnya masing – masing pada tiga lokasi sebanyak satu kali, dan parameter kohesif diambil sampelnya pada satu lokasi sebanyak dua kali pada bulan Agustus tahun 2022. Hasil prediksi sedimentasi dasar sungai model numerik adalah 1.421,86 m3/tahun sedangkan hasil prediksi volume sedimen model empirik adalah 476.941,25 m3/tahun. Upaya mengurangi prediksi volume sedimen metode USLE berupa penerapan metode tumpang-sari. Hasil kajian konservasi menunjukkan upaya yang dilakukan dapat mengurangi volume sedimen sebesar 17%.Kata Kunci:             sedimen, banjir, konservasi, tumpang-sari, Lambidaro
KAJIAN SEBARAN SALINITAS DENGAN MODEL HEC-RAS DI DAERAH IRIGASI TAMBAK SEI TERAS KALIMANTAN TENGAH Hanny Adityanta Hermawanto
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.v19i2.834

Abstract

ABSTRACTThis study aims to evaluate the distribution of salinity with a mathematical model to enhance advanced aquaculture cultivation. The Sei Teras Fishpond Irrigation Area is one of the aquaculture development areas of the food security program (Food Estate) influenced by tides. Currently, the technology used is simple, and the availability of seeds and feeds depends on nature. The water quality parameters with a specific threshold are needed as an advanced aquaculture requirement to achieve the production level. Vannamei shrimp, as a development commodity, requires a salinity concentration of 15-25 ppt for optimal growth. This study will evaluate the potential of salinity from alternative schemes of introducing gates and normalization against existing conditions using the HEC-RAS program. This program can resolve water quality models with a hydrodynamic simulation procedure through a series of mathematical equations. The simulation results show that the availability of salinity in the two tidal cycles of the spring tide and neap tide could fulfill around 86.7% for 15 days. The normalization has no significant impact on the availability of salinity against existing conditions. The gate influences the longitudinal distribution pattern of salinity. The salinity value above 19 ppt could reach the upstream of the canal up to ± 7 km, while the existing condition could only reach ± 4 km. Therefore, the expected potential of salinity could be achieved.Keywords:       salinity, model simulation, distribution, an alternative scheme ABSTRAKKajian ini bertujuan untuk mengevaluasi sebaran salinitas dengan model matematis dalam upaya meningkatkan teknik budidaya akuakultur maju. Daerah Irigasi Tambak Sei Teras merupakan salah satu wilayah pengembangan budidaya perairan dalam program ketahanan pangan (Food Estate) yang dipengaruhi oleh pasang surut air laut. Teknik budidaya saat ini tergolong tradisional dengan benih dari alam. Dalam upaya pengembangan ke level budidaya maju diperlukan parameter kualitas air dengan ambang tertentu agar produksi yang diharapkan dapat tercapai. Udang vaname sebagai komoditas pengembangan membutuhkan konsentrasi salinitas 15-25 ppt untuk tumbuh optimal. Pada kajian ini akan mengevaluasi potensi salinitas dari kondisi eksisting dan beberapa skema alternatif seperti pembangunan pintu air dan normalisasi saluran menggunakan HEC-RAS. Sebuah aplikasi yang dapat digunakan untuk menyelesaikan model kualitas air dengan pendekatan simulasi hidrodinamik melalui serangkaian persamaan matematik. Hasil simulasi eksisting menunjukkan bahwa ketersediaan salinitas pada dua siklus pasang surut spring tide dan neap tide dapat memenuhi sekitar 86,7% selama 15 hari pada dua kondisi pasang surut. Normalisasi saluran tidak berdampak signifikan terhadap ketersediaan salinitas dibanding kondisi eksisting. Adanya pintu air berpengaruh terhadap pola sebaran salinitas secara memanjang. Salinitas dengan nilai tinggi diatas 19 ppt dapat menjangkau hulu saluran hingga ± 7 km sedangkan kondisi eksisting hanya mampu terdistribusi ± 4 km. Dengan demikian, potensi salinitas yang diharapkan dapat tercapai.Kata Kunci:                   salinitas, simulasi model, distribusi, skema alternatif
PEMODELAN TIME-LAPSE MICROGRAVITY UNTUK ESTIMASI PERUBAHAN MUKA AIRTANAH DI BANDUNG, JAWA BARAT Eko Januari Wahyudi; Wawan Gunawan A. Kadir; Susanti Alawiyah; Setianingsih Setianingsih; Indra Gunawan; Dadi Abdurrahman
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.v19i2.858

Abstract

ABSTRACT Studies related to groundwater monitoring using geophysical methods have been carried out since the 1990s. Surface gavity data with a scheme of relative gravimeter measurements is chosen for monitoring in urban areas because it is quite fast, easy, affordable, and relatively low-impact on the environment. The significance of the time-lapse microgravity method for the target of this study depends on changes in the mass of water in the aquifer layer below the surface. The research area in this study covers the city of Bandung and several surrounding areas with an interpolated grid coverage of (18 x 17) km2. Gravity changes were determined by six repeated surveys at the same observation points from 2010 to 2021. The aim of this research is to develop a method for estimating groundwater table changes based on time-lapse microgravity data modeling. The complexity of subsurface density changes is simplified for two parts related to near surface density changes and density changes in the intermediate aquifer layer. The trend of groundwater table data in 2010 is used as a reference to determine estimates for 2015, 2016 (February and August), 2019, and 2021. Modeling results for intermediate aquifers (confined groundwater system) provide changes in groundwater levels from 2010 with estimates reached ±23 meters, while the results of modeling at near surface (shallow groundwater level) indicate a groundwater level change of approximately ±8 meters from the year 2010.Keywords:       microgravity, groundwater, modeling, hydrology, aquifer. ABSTRAKStudi terkait pemantauan airtanah dengan metode geofisika telah dilakukan sejak tahun 1990-an. Data gravity di permukaan dengan skema pengukuran gravimeter relatif dipilih pada pemantauan di area perkotaan karena cukup cepat, mudah, murah, dan relatif tidak merusak lingkungan. Signifikansi metode time-lapse microgravity pada target studi ini bergantung pada perubahan massa air pada lapisan akuifer di bawah permukaan. Area penelitian pada studi ini mencakup Kota Bandung dan beberapa area di sekitarnya dengan cakupan luasan interpolasi grid (18 x 17) km2. Perubahan gravitasi ditentukan oleh enam kali survei berulang pada beberapa titik pengamatan yang sama sejak 2010 sampai 2021. Tujuan dari penelitian ini adalah mengembangkan metode untuk mengestimasi perubahan muka airtanah berdasarkan pemodelan data time-lapse microgravity. Kompleksitas perubahan densitas di bawah permukaan disederhanakan untuk dua bagian terkait perubahan densitas dekat permukaan dan perubahan densitas pada lapisan akuifer menengah. Kecenderungan dari data muka airtanah pada tahun 2010 digunakan sebagai acuan untuk menentukan estimasi pada tahun 2015, 2016 (Februari dan Agustus), 2019, dan 2021. Hasil pemodelan pada akuifer menengah (sistem airtanah tertekan) memberikan perubahan muka airtanah dari tahun 2010 dengan estimasi mencapai ±23 meter, sedangkan hasil pemodelan pada kedalaman yang lebih dangkal (muka airtanah dangkal) menunjukkan perubahan muka airtanah mencapai ±8 meter dari tahun 2010.Kata Kunci:             microgravity, airtanah, pemodelan, hidrologi, akuifer
PEMODELAN TIME-LAPSE MICROGRAVITY UNTUK ESTIMASI PERUBAHAN MUKA AIRTANAH DI BANDUNG, JAWA BARAT Wahyudi, Eko Januari; A. Kadir, Wawan Gunawan; Alawiyah, Susanti; Setianingsih, Setianingsih; Gunawan, Indra; Abdurrahman, Dadi
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.v19i2.858

Abstract

 Studies related to groundwater monitoring using geophysical methods have been carried out since the 1990s. Surface gavity data with a scheme of relative gravimeter measurements is chosen for monitoring in urban areas because it is quite fast, easy, affordable, and relatively low-impact on the environment. The significance of the time-lapse microgravity method for the target of this study depends on changes in the mass of water in the aquifer layer below the surface. The research area in this study covers the city of Bandung and several surrounding areas with an interpolated grid coverage of (18 x 17) km2. Gravity changes were determined by six repeated surveys at the same observation points from 2010 to 2021. The aim of this research is to develop a method for estimating groundwater table changes based on time-lapse microgravity data modeling. The complexity of subsurface density changes is simplified for two parts related to near surface density changes and density changes in the intermediate aquifer layer. The trend of groundwater table data in 2010 is used as a reference to determine estimates for 2015, 2016 (February and August), 2019, and 2021. Modeling results for intermediate aquifers (confined groundwater system) provide changes in groundwater levels from 2010 with estimates reached ±23 meters, while the results of modeling at near surface (shallow groundwater level) indicate a groundwater level change of approximately ±8 meters from the year 2010.Keywords:       microgravity, groundwater, modeling, hydrology, aquifer.  
PENGARUH KEBERADAAN BENDUNGAN LEUWIKERIS DAN BENDUNGAN MATENGGENG TERHADAP ALOKASI AIR DAERAH ALIRAN SUNGAI (DAS) CITANDUY Alaniri, Yusanuari; Suryadi, Yadi
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. 
RESPON MODEL HBV DAN MODEL TANGKI TERHADAP ESTIMASI DEBIT ALIRAN DI DAS BOGOWONTO, JAWA TENGAH Andini, Fitri Yusti; Dasanto, Bambang Dwi; Santikayasa, I Putu
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.v19i2.830

Abstract

 The scarcity of discharge data compared to rainfall data have driven the development of the rainfall-runoff model, such as the HBV and Tank models. This research aims to apply the rainfall-runoff model in the Bogowonto watershed and to assess the model outputs. The research consisted of two main stages: 1) model calibration and validation; 2) model evaluation which assesses the model performance based on the Nash-Sutcliffe Efficiency (NSE) index and the coefficient of determination (R2). The results showed that the pattern of the simulation discharge was in accordance with the observed discharge pattern; indicating performance of both models was good (NSE > 0.7 and R2 > 0.65). However, the performance of both models in the daily simulation, particularly at the beginning of the simulation period, is still not satisfactory as the simulated discharge does not match the observed discharge. In the next simulation period, the discharge of the model results were in accordance with the observed discharge; this means the performance of the model was better. In the monthly simulation, the performance of both models is not yet satisfactory during the wet season, but it is good during the dry season. Based on the results of the daily and monthly simulations, both models demonstrate good performance under low precipitation conditions, but their performance declines under high precipitation conditionsKeywords:       Bogowonto watershed, HBV, rainfall-runoff model, simulation, tank 
KOMBINASI PREDIKSI VOLUME SEDIMEN MENGGUNAKAN METODE HECRAS-USLE UNTUK MENDUKUNG KONSERVASI DAS LAMBIDARO PALEMBANG, SUMATERA SELATAN Sultan, Masri nur; Farid, Mohammad; Prasetyo, Adi; Kusuma, Muhammad Syahril Badri; Natakusumah, Dantje Kardana
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.v19i2.851

Abstract

 Over the past ten years, flooding has been the most frequent problem in South Sumatra Province, Indonesia. As the capital of South Sumatra Province, Palembang City faces similar problems, where Lambidaro Watershed is the watershed with the highest 25-year potential flood discharge in Palembang City. One of the causes of flooding is the lack of river channel capacity related to land erosion in the watershed. This study aims to learn the prediction of sediment volume and efforts to reduce it in the Lambidaro watershed, Palembang City. This study uses two types of modeling, namely numerical models and empirical models. The numerical model uses the HEC-RAS 6.3.1 application, while the empirical model uses the USLE and SDR equations. The input parameters of the numerical model use some data derived from field measurements. The sediment concentration and observation discharge parameters were measured three times in September 2022. The grain size distribution parameters were sampled at three locations each once in August 2022, and the cohesive parameter was sampled at one location twice in August 2022. The result of the prediction of sediment volume by the numerical model is 1,421.86 m3/year. In contrast, the result of the prediction by the empirical model is 476,941.25 m3/year. Efforts to reduce the prediction of sediment volume USLE method are in the form of applying the intercropping method. The results of the conservation study show that the efforts made can reduce the volume of sediment by 17%.Keywords:       sediment, flood, conservation, intercropping, Lambidaro 
KAJIAN SEBARAN SALINITAS DENGAN MODEL HEC-RAS DI DAERAH IRIGASI TAMBAK SEI TERAS KALIMANTAN TENGAH Hermawanto, Hanny Adityanta
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.v19i2.834

Abstract

 This study aims to evaluate the distribution of salinity with a mathematical model to enhance advanced aquaculture cultivation. The Sei Teras Fishpond Irrigation Area is one of the aquaculture development areas of the food security program (Food Estate) influenced by tides. Currently, the technology used is simple, and the availability of seeds and feeds depends on nature. The water quality parameters with a specific threshold are needed as an advanced aquaculture requirement to achieve the production level. Vannamei shrimp, as a development commodity, requires a salinity concentration of 15-25 ppt for optimal growth. This study will evaluate the potential of salinity from alternative schemes of introducing gates and normalization against existing conditions using the HEC-RAS program. This program can resolve water quality models with a hydrodynamic simulation procedure through a series of mathematical equations. The simulation results show that the availability of salinity in the two tidal cycles of the spring tide and neap tide could fulfill around 86.7% for 15 days. The normalization has no significant impact on the availability of salinity against existing conditions. The gate influences the longitudinal distribution pattern of salinity. The salinity value above 19 ppt could reach the upstream of the canal up to ± 7 km, while the existing condition could only reach ± 4 km. Therefore, the expected potential of salinity could be achieved.Keywords:       salinity, model simulation, distribution, an alternative scheme 

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