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All Journal Aceh International Journal of Science and Technology
Yopi Ilhamsyah
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Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences

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Surface Energy Balance in Jakarta and Neighboring Regions As Simulated Using Fifth Mesoscale Model (MM5) Yopi Ilhamsyah
Aceh International Journal of Science and Technology Vol 3, No 1 (2014): April 2014
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1436.047 KB) | DOI: 10.13170/aijst.3.1.1302

Abstract

Abstract – The objective of the present research was to assess the surface energy balance particularly in terms of the computed surface energy and radiation balance and the development of boundary layer over Jakarta and Neighboring Regions (JNR) by means of numerical model of fifth generation of Mesoscale Model (MM5).  The MM5 with four domains of 9 kilometers in spatial resolution presenting the outermost and the innermost of JNR is utilized. The research focuses on the third and fourth domains covering the entire JNR. The description between radiation and energy balance at the surface is obtained from the model. The result showed that energy balance is higher in the city area during daytime. Meanwhile, energy components, e.g., surface sensible and latent heat flux showed that at the sea and in the city areas were higher than other areas. Moreover, ground flux showed eastern region was higher than others. In general, radiation and energy balance was higher in the daytime and lower in the nighttime for all regions. The calculation of Bowen Ratio, the ratio of surface sensible and latent heat fluxes, was also higher in the city area, reflecting the dominations of urban and built-up land in the region. Meanwhile, Bowen Ratio in the rural area dominated by irrigated cropland was lower. It is consistent with changes of land cover properties, e.g. albedo, soil moisture, and thermal characteristics. In addition, the boundary layer is also higher in the city. Meanwhile western region dominated by suburban showed higher boundary layer instead of eastern region. Keywords: MM5; Energy components; Land cover properties
Characteristics and Mineral Content of Sediment at Muara Pulau Kayu (MPK) of Southwest Aceh District Syahrul Purnawan; Zulkarnain Jalil; Chairul Akmal; Yopi Ilhamsyah
Aceh International Journal of Science and Technology Vol 7, No 1 (2018): April 2018
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (577.567 KB) | DOI: 10.13170/aijst.7.1.8524

Abstract

Study on sediment characteristics and mineral content at Muara Pulau Kayu (MPK) of Southwest Aceh District was conducted to find a general description of grain size and mineral content regarding to hydro-oceanographic process. Sampling was collected at MPK, Southwest Aceh District during March 2016. Purposive sampling method was used to determine 4 sampling sites covering estuary and beach area. Grain size and mineral content were analyzed with a set of sieves and X-Ray Fluorescence (XRF with standard reference mineral). Observation on the grain roundness and sphericity showed that sediment grains are generally more rounded at beach area. Mineral content at MPK are dominated by Si, Fe, K, Ca and Ti that are categorized into volcanic mineral which conclude that sediment at MPK originated from Mount Leuser which was an active volcano in the past.
Characteristics of Sediment at Littoral Zone of Anoi Itam Beach (Eastern Weh Island, Indonesia) Based on Seasonal Changes Syahrul Purnawan; Sofyatuddin Karina; Rizka V Ayudia; Yopi Ilhamsyah; Ichsan Setiawan
Aceh International Journal of Science and Technology Vol 9, No 3 (2020): December 2020
Publisher : Graduate Program of Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (924.505 KB) | DOI: 10.13170/aijst.9.3.16193

Abstract

Anoi Itam Beach (AIB), located in the eastern part of  Weh Island, has the sediment characteristic of dark-sand color. Climatologically, the beach is influenced by two seasons, i.e., south-west (SW) monsoon and northeast (NE) monsoon. Sediment data are collected in the upper and lower littoral zones that are divided into six stations alongshore. Data were collected on October 2016 and April 2017, representing post (SW) monsoon and post-NE monsoon events. To examine the effect of seasonal, sediments statistics, e.g., mean, sorting, skewness, and kurtosis, have been calculated. AIB was characterized as well sorted to poorly sorted sediment. Sediments were identified as mesokurtic in October, varied to leptokurtic and platikurtic in upper littoral and lower littoral, respectively, in April. Grain size in both upper and lower littoral had increased from October to April. The impact on sediment sortation was minor due to the seasonal difference. Sediments in the upper littoral vary slightly skewed than lower littoral, which response to a more positively skewed during seasonal change from SW-monsoon to NE monsoon. The results suggested that lower littoral provide high variability of sediment characteristics depend on the season.
Co-Authors Chairul Akmal Ichsan Setiawan Rizka V Ayudia Sofyatuddin Karina Syahrul Purnawan Syahrul Purnawan Zulkarnain Jalil