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Putu Sudira
Jurusan Teknologi Pangan dan Hasil Pertanian, Universitas Gadjah Mada, Yogyakarta
Agriculture, Biological Sciences & Forestry

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Prediksi Aliran Permukaan Menggunakan Modifikasi Model Bilangan Kurva Putu Sudira; Tri Purwadi; Sukresno Sukresno; Meli Nurlaili
agriTECH Vol 25, No 1 (2005)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1149.153 KB) | DOI: 10.22146/agritech.13372

Abstract

The objectives of the study are (i) to predict surface runoff of watersheds using modification of curve number model, and (ii) to find out the good fit of model application at different size of watersheds. The research was conducted in Padas sub watershed (3356.48 ha)- and Goseng sub watershed (596 ha), upper Solo watershed, Central Java. The data used for analysis were daily rainfall, daily of water level in the stream, soil type, landuse, and minimum infiltration rate from 1998 up to 2002. Surface runoff was calculated using modification of Soil Conservation Service Curve Number Model, which was integrated with the model of SWRRB (Simulator for Water Resources in Rural Basins). The use of curve number model was based on the availability of data such as soil type evaluation, landuse, conservation practices, initial soil moisture contents, and the hydrologic condition of the watersheds. Results indicated that the model was not valid for bigger watershed (Padas sub watershed). This was denoted by low values of correlation coefficient between observed and predicted surface runoff The tws, indicated that observed and predicted surface runoff are significantly different. On the other hand, for the smaller one (Goseng sub watershed) the model was agreed, it was illustrated by no significantly different between observed and predicted surface runoff based on the statistical measures above.
Penentuan Klaster Stasiun Hujan Menggunakan Analisis Komponen Utama (Studi Kasus di Daerah Istimewa Yogyakarta) Putu Sudira
agriTECH Vol 24, No 4 (2004)
Publisher : Faculty of Agricultural Technology, Universitas Gadjah Mada, Yogyakarta, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1093.269 KB) | DOI: 10.22146/agritech.13383

Abstract

The geographical condition of Yogyakarta Special Region is varied from the mountainous plateau of the Southern part (Gunung Kidul) and the northern part (Sleman) as well as the boundary of the sea level along the southern part of the region. This condition causes the great variability of the amount of rainfall in this region. Related to this, the study aims at analyzing the rainfall data to determine the cluster of the raingauge stations based on the similar characteristics of the rainfall. The data needed for the analysis is the 15 years daily rainfall data from 67 raingauge stations including the location of the stations which are unevenly distributed in 4 districts available in Yogyakarta, namely: Gunung Kidul, Sleman, Kulon Progo, and Bantul. The Principal Component Analysis was used to analyze the data to determine the cluster of the raingauge stations. The results indicated that, by applying the similarity of 57 - 60%, the characteristics of rainfall in Yogyakarta could be categorized into 7 clusters.
Co-Authors Meli Nurlaili Sukresno Sukresno Tri Purwadi