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All Journal MANAJEMEN HUTAN TROPIKA Journal of Tropical Forest Management TEKNIK Journal of Tropical Soils Indonesian Journal of Agricultural Science Jurnal Matematika Sains dan Teknologi JTERA (Jurnal Teknologi Rekayasa) LIMNOTEK - Perairan Darat Tropis di Indonesia Teknologi Indonesia Makara Journal of Science
Hidayat Pawitan
Laboratorium Hidrometeorologi, Fakultas MIPA, Institut Pertanian Bogor, Bogor 16680
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Environmental Science Industrial & Manufacturing Engineering Mathematics Mechanical Engineering Other

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Reformulation of Crop and Management Factor in ANSWERS model Hidayat, Yayat; Sinukaban, Naik; Pawitan, Hidayat; Murtilaksono, Kukuh
JOURNAL OF TROPICAL SOILS Vol. 13 No. 2: May 2008
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2008.v13i2.155-160

Abstract

Crop and management factor value is significantly corelated with outputs of ANSWERS model especially on soil erosion.   Using daily crop and management factors (daily C factors), the ANSWERS model performs well in predicting soil erosion which is showed by determination coeffient (R2 = 0.89), model efficiency (0.86), and average of percentage model deviations (24.1 %).  Whereas using USLE C factor (2 cropping systems), predicted is much higher than measured soil erosion (over estimate).  Output of the model is not statisfy, it is represented by model coefficient (0.40) and average of percentage model deviations (63.6 %).
Relationship between Concentration and Discharge on Storm Events: Case Study at Cakardipa Catchment, Cisukabirus Subwatershed, Upper Ciliwung Watershed, Bogor, West Java Heryani, Nani; Pawitan, Hidayat; Jarwadi Purwanto, Mohamad Yanuar; Subagyono, Kasdi
JOURNAL OF TROPICAL SOILS Vol. 17 No. 1: Januari 2012
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2012.v17i1.85-95

Abstract

River nutrient loadings rates are frequently determined from discharge and hydrochemistry relationships using regression techniques. Unfortunately such methods as a conventional technique are inadequate for dealing with the problem such as differences in shape and direction of loop forming in individual and seasonal storms. Besides the relationships are nonlinear and time-dependent, they also varies from site to site. There is a currently method to study hysteresis between discharge and concentration of hydrochemistry. The relationship between discharge and solute concentration was investigated at Cakardipa catchment, Upper Ciliwung watershed, between the years of 2009-2010. The characteristics of the hysteresis loops were used to evaluate the temporal variation of the relative contribution to stream flow of source waters at Cakardipa Catchment including groundwater (CG), soil water (CSO), and rain water (CR). Chemical water analysis was carried out on 497 water samples on storm event. The chemical analysis of storm event of Februari 14, 2010 was carried out for the concentrations of K+, Ca2+, Mg2+, Na+, SiO2, SO42-NO3-, Cl-, and HCO3-. Results of the experiment showed that concentrations displayed circular hysteresis loops during the events, highlighting the complex relation among solutes and discharge during storm hydrographs. The solutes of K, Na, and Ca produced  concave curvature, anti-clockwise hysteresis loops, and positive  trend, so that classified as A2 loops with components ranking were CR> CG> CSO. .The solutes of Mg, SO4, NO3 assumed to come from groundwater produced convex curvature, clockwise hysteresis loops, and positive trend, indicating a concentration component ranking of CG > CR > CSO (C2 model). While Si and Cl produced clockwise hysteresis loops, indicating a concentration component ranking of CG> CSO> CR  which was C1 model.
Co-Authors Astried Sunaryani, Astried Bambang Dwi Dasanto Edvin Aldrian Eka Intan Kumala Putri Eni Maftuah I Made Parsa Joko Windarto Kasdi Subagyono Kiyoshi Honda Kukuh Murtilaksono Laksono Trisnantoro M. Januar J.P. M. Yanuar J. Purwanto Muhammad Ardiansyah Muhammad Arsyad Naik Sinukaban Nani Heryani Ngudiantoro . Nuryanto, Danang Eko Paston Sidauruk Rahmat Hidayat Ridwansyah, Iwan Rizatus Shofiyati Robiyanto H. Susanto S. Suripin Saiful Akhyar Lubis Suria Darma Tarigan Sutapa, Ignasius Dwi Atmana Uup S. Wiradisastra Yayat Hidayat