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All Journal Journal of Tropical Soils Jurnal Keteknikan Pertanian
. Oktafri
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Agriculture, Biological Sciences & Forestry Environmental Science

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Application of Monte Carfo Simulation Method for Forecasting Discharge of a Stream Flow . Oktafri
Jurnal Keteknikan Pertanian Vol. 15 No. 2 (2001): Buletin Keteknikan Pertanian
Publisher : PERTETA

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19028/jtep.015.2.%p

Abstract

Discharge of a stream flow is one process in hydrologic cycle. Fluctuation of discharge - directly or indirectly - is more affected by rainfall intensity. Because rainfall intensity is dependent on weather (climate), discharge will be fluctuated dependent on change of weather (climate). In a long period (for example 10 years), data of discharge will become a data series. A data series of discharge is a stochastic data. There are two aspects in a data series, i.e. probability aspect and time aspects. A data series can be simulated with based on stochastic concept. One of the methods that can be used is Monte Carlo Simulation Method. Furthermore, in this paper will be exposed the resuff of accurateness of Monte Catlo Simulation Method to simulate data series of discharge. Mean weekly data series of discharge of Cikapundung stream flow (Cigulung-Cikapundung sub watershed in North Bandung - West Java), were used.
Model Simulation of “Sawah-Kolam” System for Rainwater Harvesting to Support Rainfed Paddy Production Triyono, Sugeng; Zeovany, .; Oktafri, .; Rosadi, Bustomi
JOURNAL OF TROPICAL SOILS Vol. 15 No. 3: September 2010
Publisher : UNIVERSITY OF LAMPUNG

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5400/jts.2010.v15i3.261-270

Abstract

Model Simulation of “Sawah-Kolam” System for Rainwater Harvesting to Support Rainfed Paddy Production (S Triyono, Zeovany, Oktafri, and B Rosadi): The study was used to evaluate whether rainwater could be harvested and used to meet water demand of rainfed paddy.  As generally known, yield of rainfed paddy was low compared to that of irrigated paddy.  The study was performed by simulating a model of “Sawah-Kolam” system.  Daily 10 year climatological data from Metro City of Lampung Province was used in the study.  The program was written in Professional VisSim 4.0.  Three scenarios of alternative planting schedules (January, February, and March) were tested.  Results implied that without a collection system, rainwater might not be sufficient to grow rainfed paddy.  It was demonstrated that “Sawah-Kolam” system was capable of sufficing water requirement of rainfed paddy.  Huge rainwater of more than 90% could be saved, thus reducing a lot of runoff volume.  In term of pond size, February appeared to be the most optimum growing season of all other months for Metro City, in that the pond area (1,400 m2) required was the smallest.
Co-Authors Bustomi Rosadi Sugeng Triyono Zeovany, .