Munajat Nursaputra, Munajat
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ANALYSIS OF CLIMATE AND LAND-USE CHANGES IMPACT ON WATER SECURITY IN AMBON CITY, INDONESIA USING SPATIAL MODELING Barkey, Roland Alexander; Mappiasse, Muh Faisal; Nursaputra, Munajat
Geoplanning: Journal of Geomatics and Planning Vol 4, No 1 (2017): April-Accepted papers (in proofreading process)
Publisher : Department of Urban and Regional Planning, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/geoplanning.0.0.%p

Abstract

Ambon City is the center of national activities in Maluku province, established under Presidential Decree 77 of 2014 about spatial planning of Maluku Islands. Ambon is a strategic region in terms of development of agriculture and fisheries sector. Development of the region make this area extremely vulnerable to the issues on water security. There are seven watersheds that affect the water system in Ambon City, which are Air Manis, Hutumury, Passo, Tulehu, Wae Batu Merah, Wae Lela and Wae Sikula. Therefore, this study was conducted to determine the impact of climate and land use change on water availability in seven watersheds in Ambon City. The analysis was performed by using a Soil and Water Assessment Tool (SWAT) Model to analyze climate change on the period 1987-1996 (past), period 2004-2013 (actual) and climate projection on the period 2035s (future) and analyze land use data in 1996 and 2014. The results of the research indicate that land use in the study area had changed since 1996 to 2014. Forest area decrease around 32.45%, residential areas and agriculture land increase respectively 56.01% and 19.80%. The results of SWAT model, present the water availability on the period 1987-1996 amount to 1,127.01 million m3/year and the period 2004-2013 decreased around 4.48% or to be 1,076.55 million m3/year. The results of the prediction of water availability in the future (period 2035s) estimated water availability in the study area will decrease water availability around 4.69% which is to be 1,026.09 million m3/year. The conditions describe land use and climate change has greatly contributed to the level of water availability in seven watersheds in Ambon City. Land use planning in the Ambon City really need to be considered especially in applying spatial plan. The forest area necessary to maintain. Land had developed into built-up area, it is necessary to implement of green space and water harvesting in order to maintain water security in the future.
KLASIFIKASI TINGKAT KEKERINGAN PADA DAERAH ALIRAN SUNGAI (DAS) LIMBOTO (Classification Of Drought Level In Limboto Watershed) Ayuba, Sri Rahayu; Nursaputra, Munajat; Tisen, Tisen
JURNAL SAINS INFORMASI GEOGRAFI Vol 1, No 2 (2018): Edisi November
Publisher : Universitas Muhammadiyah Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (635.102 KB) | DOI: 10.31314/jsig.v1i2.174

Abstract

Abstract - Changes in land use are the socio-economic forces that most encourage changes and ecosystem degradation. Disruption of the hydrological cycle has caused "3 T" classic problems of water "too much (which causes flooding)," too little (which causes drought) and "too dirty (which causes water pollution). Based on data from BNPB in 1979-2009 there were 8 drought events in Gorontalo Province. This research was carried out in the Limboto Watershed with an area of 86412.6 ha. The method used is the SWAT Method (Soil and Water Assessment Tool) using ArcSwat software that integrates GIS. This research is included in non-experimental research that is by using direct observation in the field. Input of SWAT data include slope, land cover type, climate, and soil type. The analysis used in determining the vulnerability of the watershed to drought is to use the Soil Moisture Deficit Index (SMDI) through the Soil Water (SW) parameter. In this study the use of SWAT model output through ArcSwat, has been able to describe the condition of water supply in the Limboto watershed, which as a whole has been included in the "Vulnerable" category. By comparing the area that experienced drought before and after simulation / running land use directives, it can be concluded that the difference in the area of the watershed that experiences drought with the "Vulnerable" classification is obtained 37,513.1 ha or a decrease of 43.4% from watershed area. Keywords: Drought, Direction for Land Use, Limboto River Basin, Landing Simulation Abstrak – Perubahan penggunaan lahan merupakan kekuatan sosial ekonomi yang paling mendorong perubahan dan degradasi ekosistem. Terganggunya siklus hidrologi telah menimbulkan “3 T” masalah klasik air “too much (yang menimbulkan banjir), “too little (yang menimbulkan kekeringan) dan “too dirty (yang menimbulkan pencemaran air). Berdasarkan data BNPB tahun 1979-2009 terdapat 8 kejadian kekeringan di Provinsi Gorontalo. Penelitian ini dilaksanakan pada Daerah Aliran Sungai (DAS) Limboto dengan luas DAS 86412,6 ha. Metode yang digunakan adalah Metode SWAT (Soil and Water Assessment Tool) dengan menggunakan software ArcSwat yang terintegrasi SIG. Penelitian ini termasuk dalam penellitian non-eksperimen yakni dengan menggunakan pengamatan langsung di lapangan. Input data SWAT antara lain lereng, jenis tutupan lahan, iklim, dan jenis tanah. Analisis yang digunakan dalam menentukan kerentanan DAS terhadap kekeringan adalah dengan menggunakan Soil Moisture Deficit Index (SMDI) melalui parameter Soil Water (SW). Pada penelitian ini penggunaan output model SWAT melalui ArcSwat, telah mampu menggambarkan kondisi pasokan air pada DAS Limboto, yang secara keseluruhan telah termasuk dalam kategori “Rentan”. Dengan membandingkan luas area yang mengalami kekeringan pada sebelum dan setelah dilakukan simulasi/running arahan penggunaan lahan maka dapat disimpulkan bahwa selisih luas area DAS yang mengalami kekeringan dengan klasifikasi “Rentan” diperoleh 37.513,1 ha atau secara persentasi mengalami penurunan sebesar 43,4 % dari luas DAS. Kata Kunci: Kekeringan, Arahan Penggunaan Lahan, Daerah Aliran Sungai Limboto, Simulasi Arahan