Articles

Interpretation of Soil Water Content into Dryness Index: Implication for Forest Fire Management Taufik, Muh; Setiawan, Budi Indra
JURNAL MANAJEMEN HUTAN TROPIKA Vol 18, No 1 (2012)
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (327.185 KB) | DOI: 10.7226/jmht.18.1.31

Abstract

Forest fire research is very important for tropical regions as the current available models on forest fire predictions and control were developed based on studies conducted in dry sub-tropical forest areas. The use of dryness index (DI) based on actual soil water  content for assessing fire danger in wetland ecosystem was proposed in this paper. The study site was located in South Sumatera, Indonesia and study was conducted from April 1 st 2009 to March 15 th 2011.  Fire danger was categorized into 4 levels; low, medium, dry, and extreme with its margin level was determined based on soil water retention curve analysis.  All DI categories occurred in 2009, however only 2 categories (low and medium) were observed in 2010 and 2011.  DI reached its maximum intensity in September 2009 with an onset rate of 1.4 per day based on analysis of time intensity curve.  Information of onset rate is importance for forest fire management such as for  estimating when the extreme category would be reached.  Therefore anticipation and prevention efforts might be prepared prior to reaching certain  danger level.  Information on DI might be useful for water management planning in forest plantation areas as many of them are located in wetland ecosystem.Keywords: dryness index, soil water content, wetland, onset rate, danger level
Applicatin of Some Evapotranspiration Models at Tropical Region Suprayogi, Slamet; Setiawan, Budi Indra; Prasetyo, Lilik Budi
Jurnal Keteknikan Pertanian Vol 17, No 2 (2003): Buletin Keteknikan Pertanian
Publisher : PERTETA

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Abstract

Potential evaporation (ETp) can be calculated by ETp models climatological parametrs. Among them, the Penman model is most frequently used for ETp estimation. The penman model requires five climatic parameters : temperature, relative humidity, wind, saturation vapor pressure, and net radiation. It also uses complicated unit conversions and lengthy calculation. There are a simple models such as : Jensen - Haise models, Hargreaves, Radiation, Turcs, and Makkinks model. These models that requires only two climatic parameters, temperature and incident radiation.
TheSimulation of Numerical Method of Finite Difference for Predicting the Distribution of Volumetric Water and Water Potential Latief, Tamrin; Hermantoro, .; Setiawan, Budi Indra
Jurnal Keteknikan Pertanian Vol 14, No 3 (2000): Buletin Keteknikan Pertanian
Publisher : PERTETA

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Abstract

This paper describes an application of n~rmerical method of finilsdzflerence for predicting the distribution of volumetric water (8) and water potential (v by using diffusity and conductivity approach. The result of current study showed that the parameters, volumetric water and water potential, correlated reversely. The trend of application of numerical method was similar to that of exact method. The simulation of parameters was not signiJcant. The reliability of models is still needed to test emperically.
Reconstruction of The Inner Baduy’s Ecohouse Structure in Banten Province Widyarti, Meiske; Setiawan, Budi Indra; Arifin, Hadi Susilo; Yuwono, Arief Sabdo
Forum Pasca Sarjana Vol 35, No 1 (2012): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

Environment quality has been worsening year by year; and building’s sector contributes 66% of fossil fuels pollution’s sources. The technique in building constructions needs to changing in order to increase environmental friendly manner. Indigenous people, such as the Inner Baduy community, from longstanding experience have developed systems as their local wisdoms adapting to its environment and houses in a sustainable manner. The objective of this study is to emphasize the importance of traditional knowledge in terms of providing low input energy buildings and settlement. A reconstruction of the Inner Baduy house has been drawn as a documentation of an Indonesian traditional house building in a tropical humid climate. The reconstruction is presented in a form of a technical drawings such as plan, view and section  drawing by using SkecthUp computer program. Baduy local wisdom of community is significant  in houseing structure development process. Indications by all the structure materials is taken from local sources such as rumbia roof and bamboo’s wall are taken from leuweung lembur and bantaran sungai. Development system’s local wisdom also very economic and efficient using pre-fabrication system. Key  words:  ecological design, environmental friendly, traditional building, sustainable construction
Sustainable Groundwater Management Model for Pump Irrigation at the District of Wajo in South Sulawesi Province ., Suhardi; Pawitan, Hidayat; Setiawan, Budi Indra; Waspodo, Roh Santoso B.
Forum Pasca Sarjana Vol 31, No 3 (2008): Forum Pascasarjana
Publisher : Forum Pasca Sarjana

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Abstract

Groundwater in the District of Wajo is stored in Siwa-Pompanua basin covering an area of 93,900 ha and discharge of around 379 millions m3/yr.  The groundwater is utilized to irrigate rain-fed rice fields privately by farmers by means of wells.  The distance between wells and pumping rate are designed without considering the characteristics of the aquifer and adequate irrigation management so that damage in environment might occur and consequently farming might not be sustainable.  A research was conducted with the objectives to study the aquifer characteristics and to develop environmentally friendly groundwater management.  Mathematical models were developed by combining equations of conservation of fluid mass (continuity equations) and Darcy’s law, whereas models of groundwater management were based on crop water requirement and aquifer characteristics.  Test of the model resulted in coefficient of determination equal to 0.848 for the prediction of the drawdown groundwater head.  The result of the model optimization indicated the optimum discharge of each of the wells was different.  One of the wells had a the biggest discharge of 1,268.33 m3/day irrigating 27.58 ha and one other  of the wells had a the smallest discharge of 279.54 m3/day irrigating 6.08 ha of paddy fields based on the irrigation water requirement of 45.99 m3/ha.day.  The reasonable minimum area (ha) determined with equation of power function in x, where x are irrigated hours per season.  For one of planting season/yr, the coefficients of the power (α) equal to 0.0123 and the power functions (β) equal to 0.7247, while for two of planting season/yr with α equal to 0.0047 and β equal to 0.8413.   Key words: sustainable groundwater utilization, paddy field irrigation, groundwater management model
ANALISIS PERUBAHAN IKLIM LOKAL DAN DEBIT SUNGAI DI DAS CIDANAUANALYSIS OF LOCAL CLIMATE CHANGE AND DISCHARGE IN CIDANAU WATERSHED Irsyad, Fadli; Saptomo, Satyanto Krido; Setiawan, Budi Indra
Jurnal Agromet Indonesia Vol 25, No 1 (2011): JUNE 2011
Publisher : PERHIMPI (Indonesian Association of Agricultural Meteorology)

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Abstract

Climate change causes uncertainty in water availability. The change may include annual rainfall, evapotranspiration and the shift of rainy and dry seasons, thus, it affects hydrological response in the region. Water demand will increase over time with population, industrial and business growth but the water availability has not been ascertained to sustainably satisfy those needs.  Cidanau Watershed has wetland ecosystem so-called the Rawa Danau (Caldera), with an area of around 2,500 ha. This watershed receives average annual rainfall around 2,500 mm. Climate change especially the local climate in the region of Cidanau was analyzed to illustrate how the relationship with Cidanau river discharge. It is expected that climate change does not affect the water availability in the watershed. In this study, the analysis of local climate change and its impact on the availability of water resources on Cidanau Watershed was based on climate trends, water balance analysis, and estimation of  discharge of Cidanau Watershed. This research was carried out using climate data and discharge from 1996 until 2010. The results showed that climate variables have changed from 1996 to 2010. This change mainly occurred in temperature, annual rainfall, and evapotranspiration. Based on the analysis, the discharge of Cidanau Watershed will decrease due to changes in rainfall and evapotranspiration. The estimated minimum river discharge of Cidanau Watershed ranges from 0.5 to 1 m3/s until 2050.
Application of Tank Model for Predicting Water Balance and Flow Discharge Components of Cisadane Upper Catchment Arifjaya, Nana Mulyana; Kusmana, Cecep; Abdulah, Kamarudin; Prasetyo, Lilik Budi; Setiawan, Budi Indra
JURNAL MANAJEMEN HUTAN TROPIKA Vol 17, No 2 (2011)
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (300.264 KB) | DOI: 10.7226/jmht.17.2.63-70

Abstract

The concept of hydrological tank model was well described into four compartments (tanks). The first tank (tank A) comprised of one vertical (qA0) and two lateral (qA1 and qA2) water flow components and tank B comprised of one vertical (qB0) and one lateral (qB1) water flow components. Tank C comprised of one vertical (qC0) and one lateral (qC1) water flow components, whereas tank D comprised of one lateral water flow component (qD1).  These vertical water flows would also contribute to the depletion of water flow in the related tanks but would replenish tanks in the deeper layers. It was assumed that at all lateral water flow components would finally accumulate in one stream, summing-up of the lateral water flow, much or less, should be equal to the water discharge (Qo) at specified time concerns. Tank A received precipitation (R) and evapo-transpiration (ET) which was its gradientof (R-ET) over time would become the driving force for the changes of water stored in the soil profiles and thosewater flows leaving the soil layer.  Thus tank model could describe th vertical and horizontal water flow withinthe watershed. The research site was Cisadane Upper Catchment, located at Pasir Buncir Village of CaringinSub-District within the Regency of Bogor in West Java Province.  The elevations ranged 512 –2,235 m above sealevel, with a total drainage area of 1,811.5 ha and total length of main stream of 14,340.7 m.  The land cover wasdominated by  forest  with a total of 1,044.6 ha (57.67%),  upland agriculture with a total of 477.96 ha (26.38%),mixed garden with a total of 92.85 ha(5.13%) and semitechnical irigated rice field with a total of 196.09 ha (10,8%).  The soil was classified as hydraquent (96.6%) and distropept (3.4%).  Based on the calibration of tank model application in the study area, the resulting coefficient of determination (R2) was 0.72 with model efficiency (NSE)of= 0.75, thus tank model could well illustrate the water flow distribution of Cisadane Upper Catchment. The total water yield was 2.789 mm year-1 from 3,624 mm year-1 of total annual precipitation.  The total water yield comprised of a total runoff of 47.39% and  49.23%  of sub surface flow and base flow.Keywords: tank model, Cisadane upper catchment, base flow, watershed
Economic Valuation for Cidanau Watershed Area, Indonesia Yoshino, Kunihiko; Setiawan, Budi Indra; Furuya, Hideki
JURNAL MANAJEMEN HUTAN TROPIKA Vol 16, No 1 (2010)
Publisher : Bogor Agricultural University

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Abstract

The paper describes economic valuation for the Cidanau watershed area of West Java in Indonesia. In this area natural resources deterioration has occurred even faster after the Asian Financial Crisis. The deforestation area and pronounced soil erosion seems to go unhindered because of land use competition among the residents for agricultural space, housing, etc. In order to prevent the area from further degradation, the purpose of this paper is to carry out quantitative evaluation which also attempts to raise the environmental awareness of residents, as well as visitors to the area. Questionnaire surveys were conducted and analyzed according to the Contingent Valuation Method (CVM) and the Travel Cost Method (TCM). The results show all respondents held good attitudes towards the efforts of environmental conservation, but responded negatively if they had to contribute to the environmental service payment. Visitors to the Anyer Beach acted differently because most of them come from faraway locations and have little knowledge of the watershed. However, the Anyer Beach recorded an environmental valuation of about Rp840 billion, which is a potential source for the service payment of Cidanau watershed. Keywords: economic value, Contingent Valuation Method, Travel Cost Method, Cidanau
Rekayasa Mesin Pengering Metoda Vakum dengan Suhu dan Tekanan Terkendali (Design of Vacuum Dryer with Controlled Temperature and Pressure) Muhammadiah, Muh. Sakti; Setiawan, Budi Indra; Erizal, .; Nelwan, Leopold O.; Nugroho, Naresworo
Teknik Mesin "TEKNOLOGI" Vol 15, No 1 Apr (2012)
Publisher : Universitas Negeri Makassar

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Abstract

The objective of this research was to design and construct a model of vacuum dryer under an environmental air pressure of less than 1 atm and test its performance. Drying is a method of reducing water content containing in a material from initial condition until desired final level. Vacuum drying is a method of drying that is still rarely used. This drying method has the advantage of reducing drying time using lower temperature and pressure compared to that of the conventional one commonly used. This research has resulted in such vacuum drying machine model with air temperature and pressure that can be controlled. Key words: dryer, vacuum, design, construction, control
Konsep Ecohouse pada Rumah Baduy Dalam Widyarti, Meiske; Setiawan, Budi Indra; Arifin, Hadi Susilo; Yuwono, Arief Sabdo
Jurnal Keteknikan Pertanian Vol 25, No 2 (2011): Jurnal Keteknikan Pertanian
Publisher : PERTETA

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Abstract

Abstract Environment quality is worsening every year; building’s sector contributes 66 % of fossil fuels   pollution sources. Ways in building constructions needs to be changed in more environmental friendly manner. Today, in spite of new technological advances in techniques and materials, buildings are continuously being built but lack of climatic consideration. Indigenous people, such as the Inner Baduy community, from longstanding experience have developed systems as their local wisdoms adapting to its environment and buildings in a sustainable manner. The aim of this study is to emphasize the importance of traditional knowledge in terms of providing environmental friendly buildings and the existence of documentation as a knowledge base of an Indonesian traditional settlement in a hot humid climate’s mode. The study results are reconstructions on, building design will be presented in technical drawings and drawn with Sketch up computer program. Keywords: Baduy, design, ecohouse, local wisdom Abstrak Sektor bangunan menyumbang 66% dari sumber polusi bahan bakar fosil yang akan berdampak pada memburuknya kualitas lingkungan. Teknik konstruksi bangunan perlu diubah dengan cara yang lebih ramah lingkungan. Meskipun kemajuan dalam teknologi pembangunan berkembang pesat, dan  bangunan yang terus menerus dibangun  akan tetapi dalam penggunaan teknik dan material bangunan tidak mempertimbangkan kerusakan iklim yang ditimbulkan. Masyarakat adat, seperti masyarakat Baduy Dalam telah berpengalaman sejak lama dalam konservasi lingkungan yang dilaksanakan sebagai kearifan lokal mereka termasuk dalam pembangunan konstruksi rumah. Tujuan dari penelitian ini adalah 1) untuk mengevaluasi dan mendapatkan  pengetahuan dalam bangunan tradisional dan 2) Mendokumentasikan konsep bangunan tradisional Indonesia sebagai dasar dalam pembangunan pada  wilayah beriklim panas lembab. Hasil penelitian ini bangunan di Baduy Dalam merupakan bangunan yang berkelanjutan. Bangunan ini direkonstruksi dan disajikan dalam gambar teknik yang digambar dengan program komputer Sketchup 2008. Kata Kunci: Baduy Dalam, konstruksi eco-house, kearifan lokal Diterima: 21 April 2011; Disetujui: 16 Agustus 2011