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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 6 Documents
 1 
Search results for , issue "Vol 18, No 1 (2022)" : 6 Documents clear
EVALUASI DAMPAK BANJIR AKIBAT PERUBAHAN ALUR SUNGAI CITANDUY HULU DI DESA TANJUNGKERTA, TASIKMALAYA-JAWA BARAT Ari Azhar Maulana; Harnita Rosalina
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.745

Abstract

Since 1996 there have been frequent floods in the upstream area of the Citanduy River, especially during the rainy season. The flood also inundated part area of the Suryalaya Islamic Boarding School located in Tanjungkerta Village, Pagerageung District, Kabupaten Tasikmalaya. In this case, the community took the initiative with self-subsident activities to reduce the impact of flood by diverting the Citanduy River channel without any communication with river authority. This analysis purposed to evaluate the cross-section capacity due to narrowing the upper Citanduy River. Hydrological analysis was initiated to determine the characteristics of catchment area in study area. 1D and 2D hydraulic analysis using HEC-RAS application with unsteady flow analysis to determine water level, flood distribution, and river flow velocity. Using the annual Q25 plan discharge taking into existing capacity and geometric characteristics. Validation of modeling results by observing directly the water level at locations that affected by flooding condition due to high rainfall intensity. Conclusions are based on the results of hydraulic hydrological analysis applied to the research object. Shortening of river channel due to siltation causes a decrease in the area of the river channel in bank conditions. Actually condition of the Citanduy River after draining discharge over a 2-year return period, there was a flood in the river cross-section of Sta. 400 – 1035 rivers overflow with variations in depth of ±40 – 80 cm when model with a discharge period of 25-years.  The recommendation for further research is to assess the river capacity to analyze erosion and sedimentation that occurs in the watershed. Conducting a more comprehensive study, involving the three core components, that is Hydraulics, Ecology, and Morphology, so that proposed alternative solutions have a good impact on all aspects, not only solving one problem but causing other problems.Keywords : Flood modeling, river shortcut, Upper Citanduy River  AbstrakSejak tahun 1996 sering terjadi banjir terutama saat musim hujan di  wilayah hulu Sungai Citanduy. Banjir tersebut juga menggenangi sebagian kawasan Pondok Pesantren Suryalaya berlokasi di Desa Tanjungkerta, Kecamatan Pagerageung, Kabupaten Tasikmalaya. Dalam hal ini masyarakat berinisiatif melaksanakan kegiatan swadaya untuk mengurangi dampak banjir tersebut dengan melakukan pengalihan alur Sungai Citanduy namun dilaksanakan tanpa sepengetahuan pihak pengelola sungai. Adapun analisis ini bertujuan mengevaluasi kapasitas penampang akibat penyudetan Sungai Citanduy Hulu. Analisis hidrologi dimulai untuk menentukan karakteristik daerah tangkapan air di lokasi pengukuran. Dilanjutkan analisis hidraulika 1D dan 2D dengan menggunakan unsteady flow analysis aplikasi HEC-RAS untuk mengetahui tinggi muka air, sebaran banjir dan kecepatan aliran sungai. Digunakan debit rencana Q25 tahunan mempertimbangkan kapasitas & karakteristik geometri eksisting. Validasi hasil pemodelan dengan meninjau langsung tinggi muka air pada lokasi terdampak banjir karena intensitas hujan tinggi. Ditarik kesimpulan berdasarkan hasil analisis hidrologi hidraulika yang diterapkan pada objek studi, bahwa pemendekan alur sungai akibat penyodetan, menyebabkan pengurangan luas alur sungai kondisi bankfull. Kondisi Sungai Citanduy setelah penyodetan debit diatas periode ulang 2 tahun, terjadi banjir pada penampang sungai Sta. 400 – 1035 sungai yang mengalami overflow dengan variasi kedalaman ±40 – 80 cm ketika dimodelkan dengan debit periode ulang 25 tahun. Adapun rekomendasi studi selanjutnya agar dilaksanakan peninjauan terhadap kapasitas sungai untuk menganalisis erosi dan sedimentasi yang terjadi pada Daerah Aliran Sungai. Melakukan kajian yang lebih komprehensif, melibatkan ketiga komponen inti yakni Hidraulik, Ekologi, dan Morfologi sehingga didapatkan hasil usulan alternatif solusi pengaruh baik terhadap seluruh aspek tidak hanya menyelesaikan satu masalah namun menimbulkan masalah lainnya.Kata kunci : Pemodelan banjir, sodetan, Sungai Citanduy
KAJIAN LAJU INFILTRASI PADA LERENG YANG TERTUTUP ABU VULKANIK BERDASARKAN EKSPERIMEN SKALA LABORATORIUM Nugroho, Joko; Soekarno, Indratmo; Yunita, F Tata; Kuntoro, Arno Adi
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.744

Abstract

Indonesia has 129 active volcanoes; therefore, the volcanic-related disasters risk is relatively high. Lahar flood is a secondary post-eruption disaster, which is triggered by the rainfall due to the movement of volcanic material by the runoff. After the eruption, there will be some significant changes in the watershed characteristics, especially the land cover, slope, and eruption material. This condition increases the possibility of the lahar flood events. Several studies have indicated an increase in runoff due to volcanic ash deposits on slopes. In this regard, the aim of this research is to understand the effects of volcanic ash layer on the slope on the infiltration rate. The physical model laboratory in the form of a laboratory-scale demonstration plot (demplot) were used, where the parameters reviewed include the slope, the volcanic ash thickness, and the rainfall intensity. The results indicate that the infiltration rate on the slopes covered with volcanic ash decreases with the average decrease in the ratio of infiltration to total rainfall about 1.6% per 1 cm thickness of the volcanic ash layer. In addition, the decrease in infiltration rate per 1 cm thickness of volcanic ash on a slope with a slope of 80 was higher (2.3%), compared to a slope of 150 (0.7%). The Philip's infiltration model fits better with the actual measurement data than the Green-Ampt one. The significant parameter in influencing the infiltration rate of the volcanic ash layer with Philip's model based on sensitivity analysis is sorptivity.Keywords: Infiltration rate, Philip, Green-Ampt, volcanic ash, physical model test  
PENGEMBANGAN KURVA DISTRIBUSI HUJAN SINTETIS DI KOTA BEKASI, JAWA BARAT Ginting, Segel
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.708

Abstract

The rainfall time distribution has a significant influence in determining the peak magnitude and the volume of runoff as well. Generally, rainfall-based runoff predictions require a rainfall-time distribution, and are usually met using patterns generated from other areas, thus giving inaccurate results. For this reason, time distribution of rainfall pattern is needed in accordance with local and specific conditions, especially in Bekasi City. This study aims to develop a synthetic rainfall time distribution pattern in Bekasi City, so that it can assist planners in designing appropriate drainage channel dimensions. Various types of rain data are needed for this study. Short duration of rainfall data with a recording interval of 5 minutes from 2010 to 2020 at the Bekasi rainfall station were collected. The data is processed into rain data for 5 minutes, 10 minutes, 15 minutes, 30 minutes, 1 hour to 3 hours. The method used is frequency analysis of historical data by forming a graph that connects the percentage of rainfall accumulation with the percentage of rainfall duration. As a result, a rainfall time distribution pattern has been formed in Bekasi City for a duration of 60 minutes to 180 minutes. The produced synthetic rainfall time distribution pattern has an early peak shape and is different from the distribution pattern that has been widely used such as the Mononobe method, the Chicago method, the SCS method and the Huff method.Keywords: Hyetograph rainfall, time distribution of rainfall, urban drainage, intensity duration frequency
EVALUASI DAMPAK BANJIR AKIBAT PERUBAHAN ALUR SUNGAI CITANDUY HULU DI DESA TANJUNGKERTA, TASIKMALAYA-JAWA BARAT Maulana, Ari Azhar; Rosalina, Harnita
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.745

Abstract

Since 1996 there have been frequent floods in the upstream area of the Citanduy River, especially during the rainy season. The flood also inundated part area of the Suryalaya Islamic Boarding School located in Tanjungkerta Village, Pagerageung District, Kabupaten Tasikmalaya. In this case, the community took the initiative with self-subsident activities to reduce the impact of flood by diverting the Citanduy River channel without any communication with river authority. This analysis purposed to evaluate the cross-section capacity due to narrowing the upper Citanduy River. Hydrological analysis was initiated to determine the characteristics of catchment area in study area. 1D and 2D hydraulic analysis using HEC-RAS application with unsteady flow analysis to determine water level, flood distribution, and river flow velocity. Using the annual Q25 plan discharge taking into existing capacity and geometric characteristics. Validation of modeling results by observing directly the water level at locations that affected by flooding condition due to high rainfall intensity. Conclusions are based on the results of hydraulic hydrological analysis applied to the research object. Shortening of river channel due to siltation causes a decrease in the area of the river channel in bank conditions. Actually condition of the Citanduy River after draining discharge over a 2-year return period, there was a flood in the river cross-section of Sta. 400 – 1035 rivers overflow with variations in depth of ±40 – 80 cm when model with a discharge period of 25-years.  The recommendation for further research is to assess the river capacity to analyze erosion and sedimentation that occurs in the watershed. Conducting a more comprehensive study, involving the three core components, that is Hydraulics, Ecology, and Morphology, so that proposed alternative solutions have a good impact on all aspects, not only solving one problem but causing other problems.Keywords : Flood modeling, river shortcut, Upper Citanduy River  
PENGARUH KEBUTUHAN AIR IRIGASI TERHADAP PENURUNAN MUKA AIR TANAH MENGGUNAKAN MODFLOW-USG DI SRAGEN, JAWA TENGAH Azizah, Nuraini; Suprapto, Heri
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.736

Abstract

One of the determining factors in food security is the availability of agriculture water. Due to decreasing of rainfall and runoff, groundwater is one of the solutions for attaining agriculture's water needs. Groundwater has been depleted in the western region of Sragen Regency. It is necessary to investigate the groundwater level depletion in Sragen Regency so that production can be increased without overexploitation. MODFLOW-USG was used to simulate groundwater conditions mathematically. The model is based on current conditions and projected until 2033, with various scenarios for irrigation necessity which has 1, 0.8 and 0.7 l/s/ha that represented as conventional, System of Rice Intensification (SRI), and Alternate Wetting And Drying (AWD). For current conditions, model results show that groundwater level (GWL) decreased by 7.9 m from 1996 – 2019 without a scenario. Simulations from 2020 to 2033 using conventional water necessity show a decrease in GWL up to 2.585 m, 1.895 m for the SRI method, and 1.788 m for the AWD method. According to this result, the AWD water necessity is the most effective both in reducing groundwater table declining and maintaining plant productivity. However, the decreasing in GWL would occur as long as groundwater withdrawal continued, regardless of the scenario. Therefore, it is proposed to fulfill agricultural land’s water with other water resources such as reservoir or retention basins. Furthermore, there is a need for cropping patterns and scheduling that affect the amount of water demand, so water needs are met and do not over-exploiting the groundwater.Keywords: Groundwater, MODFLOW-USG, conventional, SRI, AWD  
PENDEKATAN SUPPLY-DEMAND UNTUK IDENTIFIKASI INDEKS KEKRITISAN AIR DI PULAU JAWA, INDONESIA Santikayasa, I Putu; Okhy Wiranta, Dimas
JURNAL SUMBER DAYA AIR Vol 18, No 1 (2022)
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.v18i1.735

Abstract

Water supply and demand are the most discussed issue in the world including in Indonesia. Java with the largest population and center for industrial and agricultural activities in Indonesia faces problems in water availability and water demand. This condition illustrates the potential of Java to experience water scarcity. This study analyzes water status in Java using the water balance approach and Water Scarcity Index. The analysis was carried out to evaluate changes in the annual water balance during a period of the 10-year average (1981-1990, 1991-2000, and 2001-2010). The rainfall data from CHIRPS and air temperature from CRU were used to calculate water availability. Water demand is calculated for the domestic, industrial, agricultural, and environmental sectors based on Indonesia water use standards. The results indicate that the average water availability in Java varies in each period. The highest water availability occurred in 1981-1990 (160 billion m3/year), while the lowest was in 1991-2000 (149 billion m3/year}. The water availability decreased from 1981 to 2010, on a per capita basis. The water scarcity index also changes every period. The area experiencing a water deficit as described by their water scarcity index as a very critical class. Moreover, DKI Jakarta and East Java Provinces are in very critical condition with more than 50% area. Based on the study results, evaluation of water balance and water scarcity index can be used to describe the water status in a certain area as the reference for decision-makers in determining programs in water resources management.Keyword: Water status, water balance, water resources management, water scarcity, spatial analysis

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