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Kasdi Subagyono

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Author-ID : 452330

Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences Engineering

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PORE SIZE DISTRIBUTION AND FLOW CHARACTERISTICS IN A FORESTED HEADWATER CATCHMENT Kasdi Subagyono; Tadashi Tanaka
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 19, No 2 (2009)
Publisher : Indonesian Institute of Sciences

ABSTRACT It is obvious in recent publications that pores and pores size distribution play an important role in flow generation, yet the study of dynamic behavior of the effects of pores and pores size distribution on flow characteristics is somewhat rare. As micro pores, mezzo pores and macro pores are various in the soil, the distribution as well as characteristics of those pores are the major factor of flow characteristics in the soils. Pores size distribution was determined considering the volumetric water content at each matric head defined from soil water characteristics curves. Mathematically, pores size distribution is calculated using formula of r = 0.15/h, where r is radius of the pore and h is matric head. The flux of water was determined by installing tensiometer and piezometer in a transect across the hillslope and riparian zone. The results showed that the different of those between hillslope and riparian provides insight that the effects of pores and pores size distribution varies with hydrological zone. In riparian zone, flows are highly affected by micropores (R2 = 0.49), mezopores (R2 = 0.26) and total porosity (R2 = 0.28), while in hillslope side only micropore is dominant. The relationship between pores size distribution and water flow suggested that in hillslope side the flow was dominated by slow flow as micro pores has affected, while in riparian zone the rapid flow was more obvious as mezopores and total porosity have affected.

Kontribusi Sumber Aliran pada Pembentukan Air Limpasan dari Lelehan dan Hujan Salju di Cekungan Hulu Kawakami, Jepang Tengah Kasdi Subagyono
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 23, No 1 (2013)
Publisher : Indonesian Institute of Sciences

ABSTRAK Penetapan sumber air yang berkontribusi dalam proses air larian sangat penting untuk mengkarakterisasi proses hidrologi di daerah beriklim sedang. Penelitian dilakukan terhadap pelelehan salju tanggal 28 Maret 2001 dan hujan pada salju tanggal 29 Maret 2001 di Kebun Penelitian Kawakami, Provinsi Nagano, Jepang bagian Tengah. Pengukuran parameter hidrometrik dan hidrokimia serta Analisis Percampuran Sumber Air (EMMA) menggunakan Ca2+ dan SO42-dilaksanakan untuk menentukan sifat dinamis dari jalur aliran air dan untuk menganalisis sumber air yang berkontribusi terhadap proses larian. Tiga sumber air yang meliputi air bumi dangkal di zona Riparian, air tanah di zona pelerengan, dan air bumi dalam di zona Riparian teridentifikasi sebagai sumber air utama dalam menentukan proses larian di DAS hulu berhutan wilayah Kawakami, masing-masing 55%, 23% dan 22% serta 73%, 12%, dan 15%. Analisis hidrometrik menunjukkan bahwa air larian bawah permukaan selama kejadian pelelehan salju dan hujan pada salju didominasi oleh aliran air bawah permukaan khususnya pada zona Riparian. Hal ini merupakan alasan mengapa air bumi dangkal di zona Riparian memiliki kontribusi terbesar pada kejadian larian. Puncak larian pada 28 Maret 2001 diidentifikasi saat pelelehan salju terjadi pada pukul 14.00 yang berkorelasi dengan suhu tertinggi. Sementara itu puncak larian pada kejadian hujan pada salju terjadi pukul 16.00 dimana jumlah hujan merupakan faktor penentu kejadian larian tersebut.

EFFECT OF LAND USE ON SPATIAL AND SEASONAL VARIATION OF WATER QUALITY IN CILIWUNG RIVER, WEST JAVA-INDONESIA Eleonora Runtunuwu; Akihiko Kondoh; Kasdi Subagyono
JURNAL RISET GEOLOGI DAN PERTAMBANGAN Vol 20, No 1 (2010)
Publisher : Indonesian Institute of Sciences

ABSTRACT Study on water quality aspects of Ciliwung river has been conducted from January 2008 to November 2009 to address the impact of land use change on its seasonal variation. Nitrogen compound of NO2 and NH4 were monitored along the Ciliwung river with different time. Land use change within the Ciliwung watershed was analyzed using remote sensing data and correlate with NO2, NO3, NH4 concentration, conductivity and pH along the river. The results showed that in area with higher populated areas such as found in the middle and downstream area of Ciliwung watershed, NO3 concentration is higher. This obvious variation was also observed for conductivity and pH. It was also observed that the more dense area as in the middle and downstream area the change of land use was obvious. The NO3 concentration is much influenced by land use and vegetation change prior to human activity. In general, NO3 observed on October 2008 was higher compared with that observed on January, April and July 2008. In October where it is rainy season, flushing of NO3 is higher and it was transported into the Ciliwung river. The temporal variation is seemed to be due to variation of rainfall generating different runoff and nutrient flushing surrounding river.

Co-Authors Akihiko Kondoh Budi Kartiwa Eleonora Runtunuwu Eleonora Runtunuwu Erni Susanti N. SUTRISNA Santun R.P. Sitorus Tadashi Tanaka Wayan Sudana

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