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Assessment of agricultural drought based on CHIRPS data and SPI method over West Papua - Indonesia

Faisol Arif, Indarto Indarto, Novita Elida, Budiyono Budiyono

Journal of Water and Land Development

2022

no. 52

44--52

This study aims to utilise Climate Hazards Group Infrared Precipitation with Stations (CHIRPS) data and Standardised Precipitation Index (SPI) method to assess agricultural drought in West Papua, Indonesia. The data used in this study is monthly CHIRPS data acquired from 1996 to 2019, daily precipitation data recorded from 1996 to 2019 from the five climatological stations in West Papua, Indonesia located at Sorong, Fakfak, Kaimana, Manokwari, and South Manokwari. 3-month SPI or quarterly SPI are used to assess agricultural drought, i.e., SPI January-March, SPI February-April, SPI March-May, SPI April-June, SPI May-July, SPI June-August, SPI July-September, SPI August-October, SPI September-November, and SPI October-December. The results showed that in 2019 agricultural drought in West Papua was moderately wet to severely dry. The most severely dry occurred in September-December periods. Generally, CHIRPS data and SPI methods have an acceptable accuracy in generating drought information in West Papua with an accuracy of 53% compared with climate data analysis. Besides, the SPI from CHIRPS data processing has a moderate correlation with climate data analysis with an average R2= 0.51.

Analysis of Optimum Garbage Heaps Age on Recovery of Landfills Dominated by Organic Solid Waste

Abbas Zaulfikar, Utomo Sudarno, Budiyono Budiyono

Journal of Ecological Engineering

2020

Vol. 21, nr 8

91--98

Landfills in developing countries, like Indonesia are dominated by organic solid waste, with water content reaching 80%. It is impossible to manage them by incineration processes. Naturally, all organic material can decompose and produce methane gas, carbon, water, as well as leave blackish fine soil-like material, called compost. Therefore, the recovery of the landfills can be done by using landfill mining methods. However, the benefits, costs, and environmental impacts of landfill mining are highly dependent on landfills age, material characteristics, disposal systems, economic and social development of the community, and climate. The main objective of this study was to analyze the optimum age of garbage heaps to obtain the right time on the recovery of the landfills. Five excavation points were prepared at 4–5, 6–7, 8–9, 10–11, and > 12 years. Each excavated material was dried, separated, and grouped according to each component, and then weighed, tabulated, and shown as a percentage of excavated garbage composition. The result shows that landfill mining can be carried out at a garbage heap aged 8–9 years in which compost landfill mining has obtained at 50%. Other discussions concern the existence of organic and nonorganic components as well as the usage of plastic bags and nappies indicating the lifestyle changes of the people.