Roland Alexander Barkey, Roland Alexander
Unknown Affiliation

Published : 3 Documents

Found 3 Documents

Geoplanning: Journal of Geomatics and Planning Vol 4, No 1 (2017): April-Accepted papers (in proofreading process)
Publisher : Department of Urban and Regional Planning, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/geoplanning.0.0.%p


Ambon City is the center of national activities in Maluku province, established under Presidential Decree 77 of 2014 about spatial planning of Maluku Islands. Ambon is a strategic region in terms of development of agriculture and fisheries sector. Development of the region make this area extremely vulnerable to the issues on water security. There are seven watersheds that affect the water system in Ambon City, which are Air Manis, Hutumury, Passo, Tulehu, Wae Batu Merah, Wae Lela and Wae Sikula. Therefore, this study was conducted to determine the impact of climate and land use change on water availability in seven watersheds in Ambon City. The analysis was performed by using a Soil and Water Assessment Tool (SWAT) Model to analyze climate change on the period 1987-1996 (past), period 2004-2013 (actual) and climate projection on the period 2035s (future) and analyze land use data in 1996 and 2014. The results of the research indicate that land use in the study area had changed since 1996 to 2014. Forest area decrease around 32.45%, residential areas and agriculture land increase respectively 56.01% and 19.80%. The results of SWAT model, present the water availability on the period 1987-1996 amount to 1,127.01 million m3/year and the period 2004-2013 decreased around 4.48% or to be 1,076.55 million m3/year. The results of the prediction of water availability in the future (period 2035s) estimated water availability in the study area will decrease water availability around 4.69% which is to be 1,026.09 million m3/year. The conditions describe land use and climate change has greatly contributed to the level of water availability in seven watersheds in Ambon City. Land use planning in the Ambon City really need to be considered especially in applying spatial plan. The forest area necessary to maintain. Land had developed into built-up area, it is necessary to implement of green space and water harvesting in order to maintain water security in the future.
Karakteristik Tanah Longsor di Daerah Aliran Sungai Tangka Arsyad, Usman; Barkey, Roland Alexander; Wahyuni, Wahyuni; Matandung, Karla Kembongallo
Jurnal Hutan dan Masyarakat VOLUME 10 NOMOR 1, JULI 2018
Publisher : Fakultas Kehutanan, Universitas Hasanuddin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24259/jhm.v0i0.3978


Landslides occur as a result of ground movement on steep slopes, and the high humidity (moisture), and the sparse vegetation (open land). The Local conditions is an interrelated components. The process of landslides can be explained that the water soak into the soil will add weight to the ground. If the water penetrates the soil acts as a watertight sliding plane, the ground becomes slippery and soil weathering on it will move to follow the slope. This study aims to determine the type of landslide, landslide characteristics and landslides causing factors. This research was conducted in September 2015 in Watershed Tangka. The study consisted of three stages, namely the determination of the coordinates of the location of the landslide, landslide determining the location of the sample, the determination of the type of landslide, slope measurements, measurements of the dimensions of landslide and infiltration. Research results obtained are the coordinates of the location of as many as 17 points landslide, landslide types of translation and rotation, land cover and soil texture. There is no difference in the type of soil, infiltration rate, vegetation, geologi, slope and rainfall in both types of landslide are found. 
ANALISIS KOEFISIEN LIMPASAN PERMUKAAN KOTA MAKASSAR DENGAN METODE COOK Nganro, Sudirman; Trisutomo, Slamet; Barkey, Roland Alexander; Ali, Mukti
TATALOKA Vol 21, No 2 (2019): Volume 21 No. 2, May 2019 (in progress)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/tataloka.21.2.%p


Rain falling on the Watershed will turn into a stream in the river, this is because the rainwater is not entirely infiltrated into the soil, the unabsorbed water is called surface runoff. Factors affecting runoff are meteorological elements and drainage elements. This study aims to calculate the surface runoff coefficient using land cover maps 2017 and 2050, slope and soil type as parameters. Cook method divides the watershed characteristics into 4 sections as parameters to calculate the runoff coefficient of topography, soil type, vegetation cover and surface deposit. Each parameter is weighted based on its characteristics to calculate the coefficient of surface runoff symbolized by the letter C. The analysis results show that in the year 2017 obtained the value of C = 0.4734 and for the year 2050 C = 0.4785. There's a difference of 0.0051 coefficient of runoff value between land use map and land cover in 2017 and 2050. The results of this study will be used to calculate the flood discharge design in the object of research in Makassar City.