Garuda - Garba Rujukan Digital

ANALISIS SENSITIVITAS PARAMETER MODEL HBV: STUDI KASUS SUBDAS CITARUM HULU Masitoh, Siti; Dasanto, Bambang Dwi
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 25, No 2 (2018)
Publisher : Research Center for Limnology

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

Model HBV adalah model konseptual yang memiliki beberapa parameter dalam struktur model. Parameter tersebut sebagian besar adalah parameter yang tidak dapat diukur secara langsung, sehingga penentuan nilai parameter tertentu secara manual dapat menyebabkan ketidakpastian dan kesalahan pada hasil simulasi. Karya tulis ini bertujuan untuk mengidentifikasi sensitivitas parameter dari model HBV dan mengevaluasi hasil model itu. Hal ini dimaksudkan agar penggunaan model HBV selanjutnya akan lebih mudah dalam menganalisis sumber kesalahan pada hasil simulasi. Model HBVÂ yang disimulasikan pada DAS Citarum Hulu menghasilkan hidrograf aliran dengan kinerja yang cukup baik sebesar 0.63 skala NSE. Walaupun model ini belum baik dalam menggambarkan pendistribusian aliran permukaan. Hal ini terlihat dari ketidakmampuan model dalam menggambarkan debit puncak aliran. Hasil analisis sensitivitas menunjukkan bahwa parameter K0, K1, dan KPerc sangat sensitif terhadap simulasi debit puncak aliran. Selain itu, parameter FC mempengaruhi volume debit total, sedangkan parameter K2 dan Kperc mempengaruhi distribusi aliran permukaan dan aliran dasar.Â Kata kunci : HBV, debit, parameter, sensitivitas

Proyeksi Perubahan Penggunaan Lahan dan Dampaknya Terhadap Respon Hidrologi DAS Ciliwung Hulu Robo, Sarif; Pawitan, Hidayat; Tarigan, Suria Darma; Dasanto, Bambang Dwi
JTERA (Jurnal Teknologi Rekayasa) Vol 3, No 2: December 2018
Publisher : Politeknik Sukabumi

Penggunaan lahan di DAS Ciliwung Hulu setiap tahunnya mengalami konversi, sehingga berdampak pada aliran permukaan dan debit puncak. Penelitian ini bertujuan untuk memproyeksikan perubahan penggunaan lahan dan dampaknya terhadap respon hidrologi DAS Ciliwung Hulu. Tools yang digunakan dalam penelitian ini terdiri dari tools analisis perubahan penggunaan lahan dan proyeksi yaitu model CLUE-S dan untuk respon hidrologi menggunakan tools HEC-GeoHMS yang dipadukan dengan tools GIS. Proyeksi perubahan penggunaan lahan pada tahun 2030 dengan nilai Kappa akurasi 0,93. Nilai NSE untuk kalibrasi dan validasi model HEC-HMS berkisar antara 0,700 â 0,621. Hasil simulasi respon hidrologi dari hasil proyeksi penggunaan lahan tahun 2030 terhadap dengan debit puncak 111,3 m3/det dan volume limpasan 6,00 x 106m3.

PENILAIAN DAMPAK KENAIKAN MUKA AIR LAUT PADA WILAYAH PANTAI: STUDI KASUS KABUPATEN INDRAMAYU Dasanto, Bambang Dwi
Jurnal Hidrosfir Indonesia Vol 5, No 2 (2010)
Publisher : Jurnal Hidrosfir Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.161 KB)

Indramayu is located on the North Coast of Java, and their the physical characteristics are low elevation, flat topography and slope about 2%. This region is vulnerable to sea level rise and / or high tide. The rate of sea level rise in this region is about 0.2 mm / year. This rate is not consideringexpansion of sea temperatures, and melting of polar ice volume. Based on the global scenario, the rate of sea level rise in the study area is a 10 mm / year and the year 2000 as the baseline year. Sea level around Indramayu region could expose many more thousands of people and billions of Rupiahs in assets to flooding. To investigate this condition, four sea level events (0.5, 1.0, 2:53 and 3:03 m) are considered in this study. Based on 0.5 and 1.0 meter of sea level four sub-district (Kandanghaur, Losarang, Sindang and Indramayu) can be inundated. For 2.53 and 3.03 meterof sea level, the flood direction to the south and almost the entire northern coast of Indramayu is affected by flooding. Four scenarios of sea level can predict the flood area, that are, around 2900, 7300, 34 600 and 42 000 ha. Number of people exposed and threatened by floods due to changes in sea level is approximately 29 000, 100 000, 351 000 and 579 000 inhabitants. The more widespread and the number of people threatened by flooding, the amount of the loss is also higher, namely 1.1, 1.9, 82.6 and 104.3 billion rupiah. In the period of 0.5 and 1.0 meter of sea level, the highest losses are in the fish pond sector, but when combined with high tide (sea surfaceheight reaches 2.53 and 3.03 m) then the paddy fields suffered very high losses.

PERSEPSI KERENTANAN BAHAYA BANJIR DAN KEKERINGAN AKIBAT PERUBAHAN IKLIM DI DAS BATANGHARI Handoko, Unggul; Boer, Rizaldi; Apip, Apip; Aldrian, Edvin; Dwi Dasanto, Bambang
LIMNOTEK - Perairan Darat Tropis di Indonesia Vol 25, No 2 (2018)
Publisher : Research Center for Limnology

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

ABSTRAKPenelitian persepsi tingkat perubahan iklim dan tingkat kerentanan daerah terhadap bahaya banjir dan kekeringan telah dilakukan di DAS Batanghari. Persepsi tersebut kemudian dianalisis konsistensinya dengan kejadian sesungguhnya. Metode penelitian yang digunakan untuk analisis persepsi menggunakan teknik wawancara accidental sampling, uji validitas, uji reliabilitias, penskoran, dan pengkelasan. Sedangkan untuk analisis konsistensi antara persepsi dengan kejadian sesungguhnya menggunakan analisis kecenderungan anomali curah hujan dan suhu udara (untuk tingkat perubahan iklim) dan membandingkan dengan peta rawan banjir dan kekeringan (untuk kerentanan daerah terhadap bahaya banjir dan kekeringan). Hasil penelitian menunjukkan bahwa di DAS Batanghari perubahan iklim telah terjadi hal ini sesuai dengan persepsi sebagian besar masyarakat yang ada di DAS Batanghari serta didukung dengan adanya peningkatan kecenderungan nilai anomali suhu dan curah hujan dari tahun ke tahun. Wilayah yang paling rentan terhadap bahaya banjir dan kekeringan berdasarkan persepsi masyarakat adalah segmen hilir DAS Batanghari, hal ini sesuai dengan peta daerah rawan bencana banjir dan kekeringan. Kata kunci : perubahan iklim, kerentanan, banjir, kekeringan, DAS Batanghari

PENILAIAN DAMPAK KENAIKAN MUKA AIR LAUT PADA WILAYAH PANTAI: STUDI KASUS KABUPATEN INDRAMAYU Dasanto, Bambang Dwi
Jurnal Hidrosfir Indonesia Vol 5, No 2 (2010)
Publisher : Jurnal Hidrosfir Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (890.161 KB)

Indramayu is located on the North Coast of Java, and their the physical characteristics are low elevation, flat topography and slope about 2%. This region is vulnerable to sea level rise and / or high tide. The rate of sea level rise in this region is about 0.2 mm / year. This rate is not consideringexpansion of sea temperatures, and melting of polar ice volume. Based on the global scenario, the rate of sea level rise in the study area is a 10 mm / year and the year 2000 as the baseline year. Sea level around Indramayu region could expose many more thousands of people and billions of Rupiahs in assets to flooding. To investigate this condition, four sea level events (0.5, 1.0, 2:53 and 3:03 m) are considered in this study. Based on 0.5 and 1.0 meter of sea level four sub-district (Kandanghaur, Losarang, Sindang and Indramayu) can be inundated. For 2.53 and 3.03 meterof sea level, the flood direction to the south and almost the entire northern coast of Indramayu is affected by flooding. Four scenarios of sea level can predict the flood area, that are, around 2900, 7300, 34 600 and 42 000 ha. Number of people exposed and threatened by floods due to changes in sea level is approximately 29 000, 100 000, 351 000 and 579 000 inhabitants. The more widespread and the number of people threatened by flooding, the amount of the loss is also higher, namely 1.1, 1.9, 82.6 and 104.3 billion rupiah. In the period of 0.5 and 1.0 meter of sea level, the highest losses are in the fish pond sector, but when combined with high tide (sea surfaceheight reaches 2.53 and 3.03 m) then the paddy fields suffered very high losses.

Effects of Forest Cover Change on Flood Characteristics in the Upper Citarum Watershed Bambang Dwi Dasanto; Bambang Pramudya; Rizaldi Boer; Yuli Suharnoto
Jurnal Manajemen Hutan Tropika Vol. 20 No. 3 (2014)
Publisher : Institut Pertanian Bogor (IPB University)

Information on the effect of forest cover changes on streamflow (river discharge) in large-scale catchment is important to be studied. The rate of forest cover change in the Upper Citarum Watershed as a large-scale catchment is high enough to drive streamflow change, such as increase of discharge level, or flood volume. Within the research area, flood would occur when the volume of streamflow exceeded the canal capacity and inundated areas that were normally dry. Therefore, this research focused on identifying the effects of forest cover change on flood events and its distribution. The research consisted of 2 main stages; firstly, building geometric data of river and performing frequency analysis of historical and scenario discharges using an approach of probability distribution; and, secondly, flood inundation mapping using HEC-RAS model. The results showed that forest reduction have affected water yield in the downstream of Upper Citarum Watershed. In each return period, this reduction have increased river discharge level and affected the spread of flooded areas. In 2-year return period, the extent of flood as an impact of forest reduction was estimated to decrease slowly. However, in the return period of more than 2 years, the spread of flooded areas increased sharply. These proved that forest cover reduction would always increase the discharge value, but it did not always expand the inundated area.

EVALUASI DAMPAK PERUBAHAN PENGGUNAAN LAHAN TERHADAP VOLUME LIMPASAN STUDI KASUS: DAS CILIWUNG HULU, JAWA BARAT (EVALUATION OF LANDUSE CHANGE IMPACT ON RUN-OFF VOLUME CASE STUDY : CILIWUNG HULU WATERSHED, WEST JAVA) B. D. Dasanto; . Risyanto
Agromet Vol. 20 No. 2 (2006): December 2006
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

The upper Ciliwung watershed is one of the critical catchments areas in Java Island. A major element of this area is the modification of natural land-cover due to human activities. Land use change is driven by the interaction between physical and socio-economic factors. The objective of this paper is to develop a land use change model and to evaluate runoff volume based on land use prediction. The pseudo-R2 or 2 in this model is 51.7% and the calibration between predicted land use and the real is 65.5%. The analysis result of land use change for period 2005-2010 and 2015-2020 show a special change pattern. In the first period, the forest land will decrease by 85%, while resettlements land increase by 144%, so the Curve Number value will increase from 80 to 81. These indicate decreasing capability of the upper Ciliwung to retain rainfall. The impact of this condition will increase runoff volume from 660.000 m3 to be 905.000 m3. In the second period, the forest and resettlements land will increase by 612% and 28%, so the Curve Number will decrease from 80 to be 78. This will decrease runoff volume from 805.000 m3 to be 803.000 m3.

ESTIMASI NILAI LINGKUNGAN PERKEBUNAN KELAPA SAWIT DITINJAU DARI NERACA AIR TANAMAN KELAPA SAWIT (STUDI KASUS: PERKEBUNAN KELAPA SAWIT DI KECAMATAN DAYUN, KABUPATEN SIAK, PROPINSI RIAU)THE ESTIMATION OF OIL PALM PLANTATION ... Isa Teguh Widodo; Bambang Dwi Dasanto
Agromet Vol. 24 No. 1 (2010): JUNE 2010
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Dayun area is one of the centers of oil palm plantation in Siak Regency. State-owned company that develops oil palm plantation in Dayun is PT Perkebunan Nusantara V (PTPN V) which is the first company developing oil palm plantation in Siak Regency. The oil palm plantations cause various effects to the environment; one of them is the decreasing water availability for the water stakeholders. The decreasing water availability causes additional cost to the community. The objectives of this study were to determine the decreasing of water availability which was caused by oil palm plantation, and its cost to meet the needs of water. The study used water balance model by Thornwhite 1957 and Willingness to Pays (WTP) analysis using questionaire of Contingent Valuation Method (CVM) in Sawit Permai, Dayun Subdistrict, Siak Regency. The land cover, before and after, affects the water balance which impacts the water availability in Dayun. The decreasing water availability was comparable with the increasing water demand in oil palm plantation, equal to 67 mm/year. Oil palm plantation had greater runoff than that of forest. The need of water in oil palm plantation in Dayun was 42.728 liters/ha/day, with the daily need of a single palm tree equal to 0,012 m3/s. Based on the analysis of debt estimation, there is debt decreasing which indicates the decreasing water availability in Dayun, around 349 m3/s yearly. The estimated value of the environment for oil palm plantation by water resources consumption based on the difference of forest and oil palm plantation during the dry season (JJA) is equal to Rp 7.500.000. Average WTP for the water conservation program is Rp 26.400, with WTP maximum and minimum up to Rp 45.000 and Rp 5.000, respectively. The economic value of water conservation program is Rp 18.850.000/month.Dayun area is one of the centers of oil palm plantation in Siak Regency. State-owned company that develops oil palm plantation in Dayun is PT Perkebunan Nusantara V (PTPN V) which is the first company developing oil palm plantation in Siak Regency. The oil palm plantations cause various effects to the environment; one of them is the decreasing water availability for the water stakeholders. The decreasing water availability causes additional cost to the community. The objectives of this study were to determine the decreasing of water availability which was caused by oil palm plantation, and its cost to meet the needs of water. The study used water balance model by Thornwhite 1957 and Willingness to Pays (WTP) analysis using questionaire of Contingent Valuation Method (CVM) in Sawit Permai, Dayun Subdistrict, Siak Regency. The land cover, before and after, affects the water balance which impacts the water availability in Dayun. The decreasing water availability was comparable with the increasing water demand in oil palm plantation, equal to 67 mm/year. Oil palm plantation had greater runoff than that of forest. The need of water in oil palm plantation in Dayun was 42.728 liters/ha/day, with the daily need of a single palm tree equal to 0,012 m3/s. Based on the analysis of debt estimation, there is debt decreasing which indicates the decreasing water availability in Dayun, around 349 m3/s yearly. The estimated value of the environment for oil palm plantation by water resources consumption based on the difference of forest and oil palm plantation during the dry season (JJA) is equal to Rp 7.500.000. Average WTP for the water conservation program is Rp 26.400, with WTP maximum and minimum up to Rp 45.000 and Rp 5.000, respectively. The economic value of water conservation program is Rp 18.850.000/month.

MODEL PERUBAHAN PENGGUNAAN LAHAN DAN PENDUGAAN CADANGAN KARBON DI DAERAH ALIRAN SUNGAI CISADANE, JAWA BARATLANDUSE CHANGE MODEL AND CARBON STOCK ESTIMATION IN CISADANE WATERSHED, WEST JAVA Antonio Alberto; Bambang Dwi Dasanto
Agromet Vol. 24 No. 2 (2010): DECEMBER 2010
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Land use and land cover in Cisadane Watershed are very vulnerable to switch over, which is caused by the high rate of population growth. Land use and land cover change cause the carbon stock changes. These changes were analysed using the logistic regression models, and in this analysis we used land use maps in 2001 and 2006. As many as 44 regression equations were developed with various values of determination coefficient (R2); 14% of the R2 was less than 0.50, 29% was between 0.50 and 0.75, and 57% is than 0.75. Statistically, there were 31 equations suitable to generate landuse map in 2010, 2015, 2020, and 2025. The amount of carbon stocks in Cisadane Watershed until the year 2025 tend to decrease, so the sum of carbon emissions in the atmosphere increased. This was mainly due to conversion of forest area into other landuse types. Land use and land cover in Cisadane Watershed are very vulnerable to switch over, which is caused by the high rate of population growth. Land use and land cover change cause the carbon stock changes. These changes were analysed using the logistic regression models, and in this analysis we used land use maps in 2001 and 2006. As many as 44 regression equations were developed with various values of determination coefficient (R2); 14% of the R2 was less than 0.50, 29% was between 0.50 and 0.75, and 57% is than 0.75. Statistically, there were 31 equations suitable to generate landuse map in 2010, 2015, 2020, and 2025. The amount of carbon stocks in Cisadane Watershed until the year 2025 tend to decrease, so the sum of carbon emissions in the atmosphere increased. This was mainly due to conversion of forest area into other landuse types.

ANALISA POTENSI WADUK RUKOH DALAM MEMENUHI KEBUTUHAN AIR DI KABUPATEN PIDIE, INDONESIAANALYSIS OF RUKOH RESERVOIR POTENCY FOR DETERMINING WATER REQUIREMENT IN PIDIE DISTRICT, INDONESIA Siti Nurdhawata; Bambang Dwi Dasanto
Agromet Vol. 25 No. 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

Generally, reservoir can overcome problem of water availability in particular region. The reservoir collects excess water during rainy season to be used at the time of water shortage during dry season. In Pidie, the largest water sources are from Krueng Baro Geunik and Krueng Tiro. The reservoir is located at Krueng Rukoh with Krueng Tiro as the source of water supply. The reservoir provides water for irrigating and supplying domestic water in Baro (11.950 ha) and Tiro (6.330 ha) areas. There are 13 districts (216718 inhabitants) use the water from this reservoir. Given the population growing at rate of 0.52% then the water demand in the region increases. The aim of study was to estimate the volume of water entering the reservoir using the tank model. Calibration curve between the tank model output and observation data showed good correlation (R2 = 0.7). The calibrated model was then used to calculate the discharge at Krueng Baro Geunik. A water balance analysis showed that the highest deficit occurred in September and the highest surplus in November. Based on this analysis, the capacity of Krueng Rukoh reservoir is able to fulfill its function assuming the rate of population growth and the irrigation area are constant.

Title

Found 25 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 25 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 25 Documents
Search