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ANALISIS RESPON HIDROLOGI TERHADAP PENERAPAN TEKNIK KONSERVASI TANAH DI SUB DAS LENGKONG MENGGUNAKAN MODEL SWAT Firdaus, Gunadi; Haridjaja, Oteng; Tarigan, Suria Darma
Jurnal Ilmu Tanah dan Lingkungan Vol 16 No 1 (2014): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (860.332 KB) | DOI: 10.29244/jitl.16.1.16-23

Abstract

Salah satu penyebab banjir dan erosi adalah kondisi biofisik di bagian hulu Daerah Aliran Sungai (DAS) yang sudah tidak dapat mendukung fungsi hidrologis DAS. Perlu dilakukan upaya-upaya penerapan teknik konservasi tanah yang tepat untuk memperbaiki fungsi hidrologis DAS tersebut. Penelitian ini bertujuan untuk: (1) menganalisis respon hidrologi berdasarkan kondisi biofisik DAS pada tingkat analisis skala meso, dan (2) menganalisis respon hidrologi berdasarkan penerapan skenario teknik konservasi tanah. Wilayah kajian untuk penelitian adalah di sub DAS Lengkong yang terletak di bagian hulu DAS Cisadane seluas 1,788 ha. Penelitian ini dilakukan dengan menggunakan pemodelan hidrologi Soil and Water Assessment Tool (SWAT). Hasil analisis respon hidrologi terhadap penerapan skenario konservasi tanah menunjukkan Koefisien Regim Sungai sebesar 149.71 untuk skenario 1 (penanaman tanaman strip) dan 2 (penanaman pohon mengikuti kontur), sebesar 149.80 untuk skenario 3 (pembuatan teras), sebesar 150.25 untuk skenario 4 (gabungan skenario 1 dan 2), dan sebesar 149.31 untuk skenario 5 (gabungan skenario 1, 2 dan 3). Berdasarkan nisbah erosi potensial dengan erosi yang dapat ditoleransi, diperoleh indeks bahaya erosi untuk skenario 1 sebesar 2.63 (sedang), skenario 2 sebesar 2.57 (sedang), skenario 3 sebesar 0.60 (rendah), skenario 4 sebesar 2.45 (sedang), dan skenario 5 sebesar 0.44 (rendah). Penerapan teknik konservasi tanah yang mengkombinasikan penanaman pohon mengikuti kontur dan penanaman tanaman strip dengan pembuatan teras secara bersamaan, merupakan teknik konservasi tanah yang terbaik untuk memperbaiki respon hidrologi DAS, sehingga dapat direkomendasikan untuk diterapkan di sub DAS Lengkong pada khususnya, dan di DAS Cisadane bagian hulu pada umumnya.
IMPACT OF LAND USE CHANGE AND LAND MANAGEMENT ON IRRIGATION WATER SUPPLY IN NORTHERN JAVA COAST Tarigan, Suria Darma; Tukayo, Rudolf Kristian
Journal of Tropical Soils Vol 18, No 2: May 2013
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2013.v18i2.169-176

Abstract

In Indonesia, paddy irrigation covers an area of 7,230,183 ha. Ten percent (10%) of those area or 797,971 ha were supplied by reservoirs. As many as 237,790 ha (30%) of those area supplied by reservoirs are situated downstream of Citarum Watershed called Northern Java Coast Irrigation Area or Pantura. Therefore, Citarum watershed is one of the most important watershed in Indonesia. Citarum is also categorized as one of most degraded watershed in Java. The study aimed to evaluate influence of land use change on irrigation water supply in Citarum watershed and land management strategies to reduce the impact. Tremendous land use change occurred in the past ten years in Citarum watershed. Settlement areas increases more than a double during 2000 to 2009 (81,686 ha to 176,442 ha) and forest area decreased from 71,750 ha to 9,899 ha in the same time period. Land use change influences irrigation water supply through 2 factors: a) decreasing storage capacity of watershed (hydrologic functions) for dry season, and b) decreasing storage capacity of reservoirs due to the sedimentation. Change of Citarum  watershed hydrologic function was analyzed using 24 years? time series discharge data (1984-2008) in combination with rainfall data from 2000 to 2008. Due to the land use change in this time period, discharge tend to decrease despite of increasing trendof rainfall. As a result irrigation area decreased 9,355 ha during wet season and 10,170 ha during dry season in the last ten years. Another threat for sustainability of water irrigation supply is reservoir sedimentation. Sedimentation rate in the past 10 years has reduced upper Citarum reservoir (Saguling) half-life period (½ capacity sedimented) from 294 to 28 years. If proper land management strategies be carried out, the half-life period of Saguling reservoir can be extended up to 86,4 yearsKeywords: Citarum watershed, improved land management, irrigation water supply, land use change, sedimentation [How to Cite: Tarigan SD and RK Tukayo. 2013.Impact of Land Use Change and Land Management on Irrigation Water Supply in Northern Java Coast. JTrop Soils 18 (2): 169-176. Doi: 10.5400/jts.2013.18.2.169][Permalink/DOI: www.dx.doi.org/10.5400/jts.2013.18.2.169]REFERENCESAsdak. 2004. Hidrologi dan Pengelolaan Daerah Aliran Sungai. Gadjah Mada University Press. Yogyakarta (in Indonesian).BBWSC [Balai Besar Wilayah Sungai Citarum]. 2011.  Peta Informasi Citarum 2011.  Direktorat Jenderal Sumber Daya Air Departemen Pekerjaan Umum (in Indonesian).Bols PL. 1978. Iso Erodents Map of Java Madura. Technical  Assistant Project ATA 105. Soil Research Institute, Bogor, Indonesia. 39 ppBPDAS [Balai Pengelolaan Daerah Aliran Sungai] Citarum Ciliwung. 2008a. Pengelolaan DAS Terpadu ? DAS Citarum (Buku I: Laporan utama). BPDAS Citarum Ciliwung, Ditjen RLPS Dephut. Bogor (in Indonesian).BPDAS [Balai Pengelolaan Daerah Aliran Sungai] Citarum Ciliwung. 2008b. Pengelolaan DAS Terpadu ? DAS Citarum (Buku II: Data dan Informasi). BPDAS Citarum-Ciliwung, Ditjen RLPS Dephut. Bogor (in Indonesian).Bruijnzeel LA.  2004. Hydrological functions of tropical forests: Not seeing the soil for the trees? Agric Ecosyst Environ 104: 185-228.Cita. 2012. Dua puluh dua (22) Hotspost in the Citarum River Basin. www.citarum.org. Accesed on 10 October 2012.ICWRM [Integrated Citarum Water Resources Management]. 2012.  Atlas Pengelolaan Sumberdaya Air Terpadu Wilayah Sungai Citarum. Cooperation between ADB and Bappenas (in Indonesian). Kimwaga RJ, F Bukirwa, N Banadda, UG Walic, I  Nhapi and DA Mashauri. 2012. Modelling the impact of land use changes on sediment loading into lakeVictoria using SWAT model: A Case of Simiyu Catchment Tanzania. Open Environ Eng J  5: 66-76.Legowo S, KI Hadihardaja and Azmeri. 2009.  Estimation of bank erosion due to reservoir operation in cascade  (Case Study: Citarum Cascade Reservoir). ITB J Eng Sci. 41: 148-166.Perum Jasa Tirta II. 2001. Pengalaman Mengelola Bendungan Besar Waduk Ir. H. Djuanda. Perum Jasa Tirta II. Jatiluhur (in Indonesian).Shi ZH, L Ai, NF Fang and HD Zhu. 2012. Modeling the impacts of integrated small watershed management on soil erosion and sediment delivery: A case study in the Three Gorges Area, China. J Hydrol 438: 156-167.Tukayo RK. 2011. Evaluasi perubahan penggunaan lahan DAS Citarum dan dampaknya terhadap suplai air irigasi. [Thesis]. Institut Pertanian Bogor (in Indonesian).Verhaeghe RJ, B. Adriaanse and SD Tarigan. 2010. Assessment of erosion sensitivity and watershed conservation interventions for Upper Citarum basin. TA 7189-INO: Institutional Strengthening for Integrated Water Resources Management (IWRM). 6Ci?s River Basin Territory, Component B2: Spatial planning.Wang G, H Jiang, Z Hu, L Wang and W Yue. 2012. Evaluating the effect of land use changes on soil erosion and sediment yield using a grid-based distributed modelling approach. Hydrol Processes 23: 35790-3592.Yan B., NF Fang, PC Zhang and ZH She.  2013. Impacts of land use change on watershed stream flow and sediment yield: An assessment using hydrologic modelling and partial least squares regression. J Hydrol 484: 26-37.Yang  H  H, O Jaafar, A El-Shafie and S Mastura, 2011. Impact of land-use changes toward base-flow regime in Lui and Langkat Dengkil sub-basin. Int J Phys Sci 6: 4690-4976. Zheng  H, L Zhang, R  Zhu, C  Liu, Y  Sato and Y Fukushima, 2009. Responses of streamflow to climate and land surface change in the headwaters of the Yellow River Basin. Water Resour Res 45 (W00A19). doi: 10.1029/2007WR006665.
METHODS FOR DELINEATING DEGRADED LAND AT CITARUM WATERSHED, WEST JAVA, INDONESIA Tarigan, Suria Darma
Journal of Tropical Soils Vol 17, No 3: September 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i3.267-274

Abstract

Accurate information on the extent and spatial location of degraded lands is very important to plan their rehabilitation. So far, various institutions issue different estimation on the extent of degraded land in Indonesia led to big confusion for rehabilitation planning.  Ministry of Forestry estimates around 30.2 million ha of degraded land both inside and outside forestry area throughout Indonesia based on data released in 2007. Ministry of Forestry implementes the so called scoring method in delineating degraded land. Criteria used in the scoring methods are: land cover, slope steepness, erosion, and management. Scoring method applies different weight to each of those criteria. This study aimed to analyze accuracy of scoring method and to compare it to propose alternative methods in delineating degraded land such as: a) Inconsistency of land use, and b) Combination of Inconsistency of land use and scoring method. The accuracy of these methods were obtained by comparing to the field observation. The slope map was derived from SRTM 30 m, soil map was obtained from Soil Research Institute and land cover/land use from Ministry for Environment.  Using GIS analysis, those maps were used to compose land capability classification (LCC) and inconsistency of land use. The study showed that scoring method had 66% accuracy in delineating degraded land. When scoring method was combined with Inconsistency method the accuracy increased about 7%.Keywords: Degraded land; inconsistency of land use; land capability class; scoring method[How to Cite: Tarigan SD. 2012. Methods for Delineating Degraded Land at Citarum Watershed, West Java, Indonesia. J Trop Soils, 17 (3): 267-274. doi: 10.5400/jts.2012.17.3.267][Permalink/DOI: www.dx.doi.org/10.5400/jts.2012.17.3.267]
KONVERSI HUTAN MENJADI LAHAN USAHATANI KARET DAN KELAPA SAWIT SERTA PENGARUHNYA TERHADAP ALIRAN PERMUKAAN DAN EROSI TANAH DI DAS BATANG PELEPAT Sunarti, .; Sinukaban, Naik; Sanim, Bunasor; Tarigan, Suria Darma
Journal of Tropical Soils Vol 13, No 3: September 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i3.253-260

Abstract

Forest conversion to some land use happened in all watershed, includes Batang Pelepat watershed. The objectives of this research are to know effect of forest conversion to land of rubber (Hevea brasiliensis) and palm oil (Elaeis guinensis Jack) farming on run off and soil erosion and different of erosion rate on agro technology of rubber and palm oil farming in Batang Pelepat watershed. The research was carried out during 3 months, begin October to December 2006. Run off and soil erosion measured plot with gutter in the lower of plot. Experimental design for this research is randomized complete block design, with land use type as treatment and slope class as replication or block. Data analyzed statistically by variance analysis (F-test) and Duncan New Multiple Range Test on confidence 95% (? = 0.05). The results of this research show that area of forest coverage in Batang Pelepat watershed was decreasing. In 1986 this area still 94,50% of watershed area, but in 1994 area of forest only 78,17% and in 2006 forest area 64,20% of watershed area. Forest conversion was carried out to land of rubber and palm oil farming with some actual agro technologies. Land of monoculture rubber I resulted the highest run off and soil erosion more than the other land use type and showed different of run off and soil erosion on land of secondary forest. 
SOIL HYDROLOGICAL CHARACTERISTICS UNDER PINE (PINUS MERKUSII), MERAWAN (HOPEA ODORATA ROXB), AND AFRICAN MAHOGANY (KHAYA ANTHOTECA) STANDS: KARAKTERISTIK HIDROLOGI TANAH DI BAWAH TEGAKAN PINUS (PINUS MERKUSII), MERAWAN (HOPEA ODORATA ROXB) DAN MAHONI UGANDA (KHAYA ANTHOTECA) Qalbi, Andria Harfani; Tarigan, Suria Darma; Wahjunie, Enni Dwi; Baskoro, Dwi Putro Tejo
Jurnal Ilmu Tanah dan Lingkungan Vol 20 No 1 (2018): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (321.339 KB) | DOI: 10.29244/jitl.20.1.7-12

Abstract

Forest destruction may affect forest hydrological functions either as a water regulator, maintaining the timing and distribution of river water flows, maintaining microclimate, or being able to protect the underlying areas from disasters such as floods. Revegetation is considered as an effort to improve the condition of forest and environment. The objective of this study was to examine the hydrological characteristics of soil under stands of Pinus (Pinus merkusii), Ugandan Mahogany (Khaya anthoteca), and Merawan (Hopea odorata Roxb). The method used is periodic measurement of soil physical variables. Our investigation reveals that hydrological and physical properties of soil under the stands were different. Within the same depth of soil, water content changed from the highest to the lowest in Pine (3.05%), Merawan Siput Jantan (2.40%), and African Mahogany (1.89%), respectively. The highest infiltration was 116.25 cm hour-1 under Pine stand, while the lowest was 24 cm hour-1 under Merawan Siput Jantan stand. The highest permeability was 13.27 cm hour-1 under Pine stand, while the lowest was 2.72 cm hour-1 under Merawan Siput Jantan stand. Dominated by clay, the soil texture was relatively similar in each stand. Further, the soil under the three stands were categorized as the soil hydrological group B. Keywords: Infiltration, permeability, soil moisture, tree stand
BEST MANAGEMENT PRACTICE TO REDUCE FLOW DISCHARGE AND SEDIMENT YIELD IN CIUJUNG WATERSHED USING SWAT MODEL: BEST MANAGEMENT PRACTICE UNTUK MENURUNKAN DEBIT ALIRAN DAN HASIL SEDIMEN DAS CIUJUNG MENGGUNAKAN MODEL SWAT Sulaeman, Dede; Hidayat, Yayat; Rachman, Latief Mahir; Tarigan, Suria Darma
Jurnal Ilmu Tanah dan Lingkungan Vol 18 No 1 (2016): Jurnal Ilmu Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (679.996 KB) | DOI: 10.29244/jitl.18.1.8-14

Abstract

Banjir yang terjadi hampir setiap tahun di Daerah Aliran Sungai (DAS) Ciujung menyebabkan DAS ini menjadi sorotan berbagai pihak. Penelitian ini bertujuan untuk mengkaji kinerja model SWAT untuk memprediksi debit aliran dan hasil sedimen DAS Ciujung, serta mensimulasikan parameter hidrologi untuk menurunkan debit aliran dan hasil sedimen DAS Ciujung. Dalam menjalankan model SWAT terdapat beberapa tahapan kegiatan yang dilakukan yaitu: (1) deliniasi batas DAS Ciujung, (2) pembentukan HRU, (3) pendefinisian HRU, (4) input data iklim, (5) membangun input data, (6) menjalankan model SWAT, (7) kalibrasi dan validasi model, dan (8) simulasi parameter hidrologi. Model SWAT cukup baik untuk mensimulasikan debit aliran DAS Ciujung. Hal ini dapat dilihat dari hasil kalibrasi model SWAT untuk memprediksi debit aliran yang menunjukkan nilai R2 dan NSE masing-masing sebesar 0.83 dan 0.65 (baik) serta hasil validasi model masing-masing 0.78 dan 0.63 (memuaskan). Hasil sebaliknya diperlihatkan dalam memprediksi hasil sedimen DAS Ciujung dengan nilai R2 dan NSE yang dihasilkan masing-masing sebesar 0.55 dan -193.62 (tidak memuaskan). Skenario pengelolaan lahan yang diterapkan diantaranya adalah fungsi kawasan hutan, rehabilitasi lahan kritis, teknik KTA metode vegetatif dan sipil teknis, serta skenario gabungan. Berdasarkan kemampuannya dalam menurunkan aliran permukaan, hasil sedimen, dan hasil air (water yield) serta meningkatkan aliran dasar dan aliran lateral, penerapan tindakan pengelolaan lahan gabungan merupakan pengelolaan lahan yang harus dilakukan. Kata kunci: Skenario pengelolaan lahan, debit aliran sungai, parameter hidrologi, hasil sedimen, model SWAT
NERACA AIR LAHAN GAMBUT YANG DITANAMI KELAPA SAWIT DI KABUPATEN SERUYAN, KALIMANTAN TENGAH Tarigan, Suria Darma
Jurnal Ilmu Tanah dan Lingkungan Vol 13 No 1 (2011): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (436.68 KB) | DOI: 10.29244/jitl.13.1.14-20

Abstract

Penurunan muka air pada lahan gambut memicu oksidasi dan subsiden, khususnya pada musim kemarau. Agar dampak penurunan muka air dapat dikelola dengan baik, maka perlu dikaji besaran komponen neraca air (water balance) yang meliputi: a) Pre-storage, b) Evapotranspirasi, c) Ruang pori drainase, d) Konduktivitas hidrolik dan e) Drainase. Penelitian ini bertujuan mengkaji komponen neraca air tersebut pada lahan gambut yang ditanami kelapa sawit yang dapat digunakan untuk menetapkan pengelolaan drainase yang optimal. Metodologi yang digunakan dalam perhitungan kedua komponen neraca air adalah persamaan Hooghoudt Steady-State Approach yang diverifikasi dengan pengukuran data lapang terkait tinggi muka air dengan menggunakan piezometer. Penelitian lapang dilakukan pada perkebunan kelapa sawit di Kabupaten Seruyan, Kalimantan Tengah. Selama musim kemarau (Juli-September), evapotranspirasi mencapai 386 mm yang melebihi besaran curah hujan (311 mm). Jumlah air drainase pada periode ini adalah 90 mm atau 1 mm hari-1. Berdasarkan nilai-nilai tersebut terdapat defisit air sebesar 25 mm selama periode musim kemarau. Jika jarak saluran drainase ditingkatkan dari 30 m menjadi 50 mm, maka terjadi surplus neraca air sebesar 34 mm. Namun surplus tersebut hanya mampu menaikan muka air tanah sebesar 2.3 cm dari kondisi awal yang berada pada kedalaman 40-50 cm. Dalam rangka menghambat penurunan muka air pada musim kemarau maka pada masa transisi dari musim penghujan ke musim kemarau perlu dilakukan konservasi air melalui peningkatan pre-storage. Di samping itu kehilangan air drainase perlu ditekan seminim mungkin melalui pengaturan jarak saluran drainase dan penggunaan cascaded stop-log pada sistem saluran tersier.
KARAKTERISTIK HANTARAN HIDROLIK JENUH TANAH PADA PERKEBUNAN KELAPA SAWIT, PTPN VII LAMPUNG SELATAN Syahadat, Pungkas; Tarigan, Suria Darma; Murtilaksono, Kukuh
Jurnal Ilmu Tanah dan Lingkungan Vol 13 No 2 (2011): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (168.536 KB) | DOI: 10.29244/jitl.13.2.58-62

Abstract

Kelapa sawit (Elais guineensis Jacq.) merupakan salah satu tanaman yang memerlukan air dalam jumlah yang banyak. Ketersediaan air merupakan salah satu faktor pembatas utama bagi produksi kelapa sawit. Pada musim kemarau kelapa sawit akan mengandalkan cadangan air bawah tanah untuk kebutuhan airnya. Hantaran hidrolik merupakan parameter sifat fisik tanah yang berperan dalam penambahan air bawah tanah. Tujuan dilakukannya penelitian ini adalah mengetahui karakteristik hantaran hidrolik jenuh pada berbagai jenis lokasi yang meliputi gawangan mati, piringan, dan jalan pikul pada perkebunan kelapa sawit PTPN VII Lampung. Karakteristik ini dapat dijadikan acuan pengelolaan lahan agar dapat meningkatkan cadangan air bawah tanah. Nilai hantaran hidrolik jenuh pada lokasi gawangan mati berkisar antara 2.9-30.4 cm jam-1 dengan kelas sedang sampai sangat cepat, pada lokasi piringan berkisar antara 2.5-13.4 cm jam-1 dengan kelas agak lambat sampai cepat, dan pada lokasi berupa jalan pikul nilai hantaran hidrolik jenuhnya berkisar antara 1.6-12.8 cm jam-1 yang berada pada kelas agak lambat sampai cepat. Tingginya hantaran hidrolik pada gawangan mati disebabkan terjaganya struktur tanah oleh tumpukan pelepah yang sudah mati. Hasil penelitian menunjukan bahwa aktifitas pemanenan yang intensif menurunkan nilai hantaran hidrolik jenuh tanah pada areal piringan dan jalan pikul tempat mengangkut hasil panen disebabkan peningkatan kepadatan tanah.
PENGGUNAAN CITRA MODIS SEBAGAI PENDUGA SUHU DALAM PERHITUNGAN EVAPOTRANSPIRASI DENGAN METODE BLANEY-CRIDDLE (STUDI KASUS: DAS CIMADUR, BANTEN) Prachmayandini, Reyna; Tarigan, Suria Darma; Trisasongko, Bambang Hendro
Jurnal Ilmu Tanah dan Lingkungan Vol 14 No 1 (2012): Jurnal Tanah dan Lingkungan
Publisher : Departemen Ilmu Tanah dan Sumberdaya Lahan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (871.462 KB) | DOI: 10.29244/jitl.14.1.14-20

Abstract

Evapotranspirasi (ET) merupakan komponen neraca air terpenting setelah curah hujan. Saat ini, pengukuran evapotranspirasi dapat dilakukan dengan menggunakan input data yang berbasis penginderaan jauh. Penelitian ini mengembangkan rumus empirik perhitungan evapotranspirasi, yaitu Blaney-Criddle, dengan memanfaatkan nilai Land Surface Temperature (LST) yang diekstrak melalui citra Moderate Resolution Imaging Spectroradiometer (MODIS) sebagai masukan dalam komponen suhu dalam persamaan tersebut. Validasi dilakukan antara nilai LST MODIS (akuisisi siang dan malam) dan nilai T Stasiun Iklim Darmaga, pada berbagai ketinggian (5 cm, 100 cm, 120 cm) dan waktu (07.00, 07.10, 13.00, dan 13.50 WIB). Pada LST siang, temperatur yang diestimasi oleh MODIS, lebih mendekati pengukuran temperatur stasiun iklim pada ketinggian 5 cm (dibandingkan dengan pengukuran temperatur pada ketinggian lainnya) dengan nilai R2 sebesar 0.36. Sedangkan LST malam, memiliki hubungan yang cukup kuat dengan T stasiun pada ketinggian 120 cm. Namun demikian, nilai R2 tertinggi didapatkan pada hubungan antara LST malam dengan T stasiun pada ketinggian 100 cm, dengan nilai R2 sebesar 0.57. Secara umum, nilai evapotranspirasi potensial yang berada pada DAS Cimadur berada pada rentang 4.45-5.65 mm hari-1 (mendekati kondisi sebenarnya). Dengan berbasis penginderaan jauh, nilai evapotranspirasi dapat disajikan secara spasial maupun temporal. Namun demikian, terdapat kendala terkait ketersediaan data yang menyebabkan nilai evapotranspirasi hanya tersedia pada bulan-bulan kering. Penelitian ini menunjukkan bahwa jika hal ini diperbaiki dengan mengkombinasikan data LST terbaik dalam 1 bulan, ketersediaan data evapotranspirasi potensial secara spasial dan temporal dalam satu bulan dapat meningkat >50% dari kondisi awal 0%.
KAJIAN DAMPAK PERUBAHAN PENGGUNAAN LAHAN TERHADAP DEBIT ALIRAN DAS CIUJUNG Sulaeman, Dede; Hidayat, Yayat; Rachman, Latief Mahir; Tarigan, Suria Darma
JOURNAL TEKNIK SIPIL DAN INFRASTRUKTUR Vol 4, No 2 (2014)
Publisher : Jurusan Teknik Sipil Universitas Tadulako

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (542.907 KB)

Abstract

Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff Ciujung Watershed is considered as one of major watershed in Banten Province related to floods that take place almost every year in the area. The study aims to assess landuse change and its influence on discharge. Watershed conditions such as precipitation, discharge, peak discharge, volume rate of discharge, and runoff were analyzed in two periods: 1999-2003 and 2004-2011. Landuse changes were analyzed in 8 years period (2003-2011) as well as its influence on discharge. Average annual precipitation in the period of 1999-2003 and 2004-2011 are 2370 and 2419 mm respectively. Average annual discharge in the period of 2004-2011 increased by 15% compared to the period of 1999-2003. Watershed conditions analysis indicates that Ciujung watershed quality decreased with increasing in surface runoff coefficient with values of 0.43 (period 1999-2003) and 0.48 (period 2004-2011). The study showed that there are several decreasing landuses during period 2003-2011 such as open land, natural forest, mixed dry land farming, secondary dry forest, primary dry forest, and dry land farming by 47.4; 14.3; 8.4; 2.9; 1.6 and 0.1% respectively. Several increasing land uses during the period including bush, plantations, settlements, and paddy field by 1,974.5; 5.5; 3.8 and 0.9% respectively. Keywords: discharge, land use change, peak discharge, runoff