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All Journal JURNAL ILMIAH PLATAX Journal of Geoscience, Engineering, Environment, and Technology
Siburian, Daniel Tony Edyt
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Journal : Journal of Geoscience, Engineering, Environment, and Technology

 1 
Analysis Of River Ordo In The Tukad Balian Watershed (DAS), Bali Province, Indonesia Sinaga, Mardame Pangihutan; Simanullang, Ady Frenly; Siburian, Daniel Tony Edyt; Joko Barita Sianipar; Sianipar, Herna Febrianty; Sianturi, Tambos August
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 04 (2024): JGEET Vol 09 No 04 : December (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.04.18927

Abstract

River order research in Tukad Balian Watershed, Bali Province uses ArcGIS Pro to process ASTER GDEM and National DEM data. The analysis is based on: the area and Perimeter of the Watershed, Watershed Length and Width, Land Slope, Average Height, Order and Level of River Branching. The results obtained for the Watershed show that the morphometric value is an area of 15485,20 hectares, a length of 23,08 km, a land slope of 0,40%, and 5 orders of branching rivers with a total of 665 river sections. The shape of Watershed Tukad Balian roundness index value is 7,2. GIS is an effective system for reducing Watershed morphometric information. The research method used is to directly calculate the morphometric parameters of the Tukad Balian Watershed, Bali Province, namely: Area and Perimeter of the Watershed; Watershed Length and weight; River slop or gradient; Average Height; Order and Level of River Branching; Flow Density; and Watershed Form. The conclusion obtained is: The Tukad Balian watershed is a standard-sized watershed with an area of 15.485,20 Ha an average height of 200 meters above sea level and the main river channel is 10,71 Km long. There a plot sections with a total length of 23,08 Km; The elongated shape of the Tukad Balian watershed is in the medium category, where the Tukad Balian Watershed will not experience major flooding.
The Impact of Sea Surface Temperature and Containing Chlorophyll-A on The Results of Skipjack Tuna (Katsuwonus Pelamis) Catch in The Indian Ocean Waters Sinaga, Mardame Pangihutan; Siburian, Daniel Tony Edyt
Journal of Geoscience, Engineering, Environment, and Technology Vol. 10 No. 02 (2025): JGEET Vol 10 No 02 : June (2025)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2025.10.02.21643

Abstract

Oceanographic factors can be an indicator in determining the potential of fishing grounds. The sampling technique of sea surface temperature (SST) and chlorophyll-a data in this study was carried out spatially and temporal using satellite image data which can be downloaded from Aqua MODIS. This study aimed to determine variations in SST distribution and chlorophyll-a concentration in Indian Ocean waters using Aqua MODIS imagery from June 2023 to May 2024; analyzing the relationship between the distribution of SST and chlorophyll-a with the number of pelagic fish catches in the Indian Ocean waters. The type of fish used as research material is skipjack tuna (Katsuwonus pelamis). The distribution of SST in the Indian Ocean waters for June 2023-May 2024 is between 29,15-31,64 °C, where there is a significant decrease in temperature from 31,10-29,15 °C due to the east monsoon wind and the chlorophyll-a distribution is around between 0,24-0,73 mg/m³ with the highest average distribution in the western season. This phenomenon causes chlorophyll-a to increase in the western season because the frequency of rainfall in this season is sufficient, causing nutrients to increase due to vertical stirring, which can increase chlorophyll-a at the sea surface. There is no relationship between SST and chlorophyll in the number of skipjack tuna catches in transition II with a strong correlation value and a significance value (F) of 1,o, meaning that SST and chlorophyll-a on skipjack tuna to the skipjack tuna catches not influence for each season, the influence of significant event is thought to be a lag in the food chain and high rainfall. This study reveals that while variations in sea surface temperature and chlorophyll-a concentration are significant understanding oceanographic conditions, they do not directly influence skipjack tuna catch rates, suggesting that other ecological factors, such as food chain dynamics and seasonal rainfall patterns, may play a more critical role.
Co-Authors Herna Febrianty Sianipar Joko Barita Sianipar SIANTURI, TAMBOS AUGUST Simanullang, Ady Frenly Sinaga, Mardame Pangihutan Zega, Edward Kristian