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All Journal Journal of Engineering and Technological Sciences MAJALAH ILMIAH GLOBE
Miga M. Julian
Geodesy and Geomatics Engineering Study Program Faculty of Earth Sciences and Technology, Institut Teknologi Bandung
Earth & Planetary Sciences Education Engineering

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Set Up and Calibration of a Spatial Tool for Simulating River Discharge of Western Java in Recent Decades: Preliminary Results and Assessments Poerbandono, Poerbandono; Ward, Philip J.; Julian, Miga M.
Journal of Engineering and Technological Sciences Vol 41, No 1 (2009)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (629.791 KB) | DOI: 10.5614/itbj.eng.sci.2009.41.1.4

Abstract

This  paper  discusses  a  study  of  the  application  of  global  spatiotemporal climate datasets and the hydrological model STREAM   (Spatial Tools for River Basin Environmental Analysis and Management Options). In the study, set up and calibration  of STREAM for  the reconstruction of monthly discharge for several locations in the western part of Java, Indonesia, for the period 1983 -2002 are carried out. The set up includes the preparation of monthly precipitation and temperature datasets, a digital elevation model of the domain being studied, and maps of land cover and soil water holding capacity. Discharge observations from  six  stations  located  mostly  in  the  upper  parts  of  major  watersheds  in  the domain  are  used  to  calibrate  the  model  by  comparing  simulated  and  observed discharge variables. The model performs reasonably well.  Comparison  between computed and observed mean monthly discharges yield correlation coefficients ranging from 0.72 to 0.93. The  computed mean annual discharge in five out of six  observation  stations  ranges  between  -8  and  5%  with  respect  to  the  mean annual  observed  discharge.  This  study  offers  a  tool  which  can  be  used  for reconstructing historical discharge
Spatial Decision Assistance of Watershed Sedimentation (SDAS): Development and Application Poerbandono, R.; Harto, Agung B.; Julian, Miga M.
Journal of Engineering and Technological Sciences Vol 46, No 1 (2014)
Publisher : ITB Journal Publisher, LPPM ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (615.057 KB) | DOI: 10.5614/j.eng.technol.sci.2014.46.1.3

Abstract

This paper discusses the development and application of a spatial tool for erosion modeling named Spatial Decision Assistance of Watershed Sedimentation (SDAS). SDAS computes export (yield) of sediment from watershed as product of erosion rate and sediment delivery ratio (SDR). The erosion rate is calculated for each raster grid according to a digital elevation model, soil, rain fall depth, and land cover data using the Universal Soil Loss Equation. SDR calculation is carried out for each spatial unit. A spatial unit is the smallest sub-watershed considered in the model and generated according to the TauDEM algorithm. The size of one spatial unit is assigned by the user as the minimum number of raster grids. SDR is inversely proportional to sediment resident time and controlled by rainfall, slope, soil, and land cover. Application of SDAS is demonstrated in this paper by simulating the spatial distribution of the annual sediment yield across the Citarum watershed in the northwest of Java, Indonesia. SDAS calibration was carried out based on sediment discharge observations from the upper catchment. We considered factors for hillslope flow depth and for actual and effective rainfall duration to fit the computed sediment yield to the observed sediment discharge. The computed sediment yield agreed with the observation data with a 7% mean relative accuracy.
KAITAN ANTARA ASPEK PENENTUAN POSISI, PEMETAAN, DAN SISTEM INFORMASI GEOGRAFIS SERTA PERMASALAHANNYA DENGAN SUPLEMEN ELEMEN-ELEMEN SISTEM KOORDINAT Soeryamihardja, R. Danoe; Sedayu, Pipien M.; Yusfania, Meiriska; Julian, Miga M.
MAJALAH ILMIAH GLOBE Vol 10, No 1 (2008)
Publisher : Badan Informasi Geospasial

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1829.214 KB)

Abstract

Penentuan posisi, pemetaan dan Sistem Informasi Geografis (SIG) merupakan keping-keping mosaik pada suatu permasalah geodesi dan geomatika. Antara keping satu dan lainnya pasti saling berkaitan. Masalahnya tidak semua orang menganggap antara keping tersebut sebagai-kesatuan. Sebagai seorang geodet harus dapat memandang sebuah permasalah godesi dan geomatika sebagai suatu aspek penentuan posisi, pemetaan, dan SlG sebagai mosaik yang saling mendukung. Pada makalah ini disajikan sebuah studi kasus tentang permodelan erosi, sehingga terlihat jelas hubungan dan peran antara ketiga aspek tersebut. Selain itu, dari ketidakseragaman data masukan dalam penentuan erosi dapat dikaji pula mengenai variasi sistem koordinat setiap data serta proses penyeragamannya guna keberhasilan proses selanjutnya.ABSTRACTPositioning, mapping and Geographic Information Systems (GIS) are mosaic pieces on a problem of Geodesy and Geomatics. One and the other pieces must be interrelated. The problem is that not all people think of these pieces as a whole. Geodetists should look at  a problem in Geodesy and Geometics as an aspect of positioning, mapping, and GIS as a mosaic of mutually supportive. This paper will present a case study on modeling of erosion, so that relationship and role of the three aspects become apparent. ln addition, different input data for determination of erosion can be used to assess the variation of coordinate system for every data set.Kata Kunci: Posisioning, Pemetaan, SIG, Model, ErosiKeyword: Positioning, Mapping, GIS, Model, Erotion
Co-Authors Agung B. Harto Fumihiko Nishio, Fumihiko Meiriska Yusfania Philip J. Ward Philip J. Ward, Philip Poerbandono Poerbandono Poerbandono, Poerbandono Sedayu, Pipien M. Soeryamihardja, R. Danoe