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All Journal Inersia : Jurnal Teknik Sipil Zona Laut : Jurnal Inovasi Sains dan Teknologi Kelautan
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Energy Engineering Transportation

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EVALUASI KINERJA SALURAN IRIGASI DAN BANGUNAN DISTRIBUSI PADA DAERAH IRIGASI AIR NAKAI BATU ROTO BENGKULU UTARA Anisa putri, Salsabillah; Besperi; Bahri, Samsul; Makmun Reza, Razali
Inersia: Jurnal Teknik Sipil Vol. 15 No. 1 (2023)
Publisher : Universitas Bengkulu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33369/ijts.15.1.65-76

Abstract

  This study intends to analyze the dimensions of the channel, subdivision, and tapping infrastructure. The mainstay discharge was analyzed using the Mock method, the analysis of irrigation water needs was based on Irrigation Planning Standard KP-01, and recalculation of the dimensions of the channel, building for, and tapping building based on the existing discharge and the planned discharge in accordance with Irrigation Planning Standard KP- 03. Rainfall data were analyzed using the algebraic average method. The findings indicated that the highest primary discharge, which occurred in November period I, was 9.21 m3/s. The highest amount of clean water needed in the fields per day (NFR) was 7.55 mm, while the maximum amount of water needed for intake per second (DR) was 1.34 l/sec. The bottom width of the channel (b) is 2.26 m according to the findings of recalculating the BNa 1 primary channel's dimensions using the current discharge. Na.2Ki.A secondary channel measured 0.48 meters for channel bottom width (b). The bottom width of the channel (b) was determined to be 0.601 m as a consequence of recalculating the BNa 1 primary channel's dimensions using the intended discharge. Na.2Ki.A secondary channel measured 0.44 meters for channel bottom width (b). The measurements of the width of the buildings door (b) after being recalculated and tapped based on the current discharge are larger than those of the door's existing dimensions. Keywords: Water Discharge, Irrigation Channels Area, Distribution Building
Shoreline Change Analysis on Enggano Island Using the Digital Shoreline Analysis System (DSAS): A Case Study of Kahyapu, Kaana, and Malakoni Villages Maulidan, Arsyi Dafa; Besperi; Gunawan, Agustin; Amri, Khairul; Gunawan, Gusta
Zona Laut : Jurnal Inovasi Sains Dan Teknologi Kelautan Volume 7, Number 1, March 2026 Edition
Publisher : Departemen Teknik Kelautan Universitas Hasanuddin

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Abstract

Coastal shoreline change is a dynamic process that significantly affects coastal ecosystems and human activities. This study quantitatively analyzed shoreline changes along the coast of Enggano Island, Bengkulu Province, during the period 1993–2025, focusing on Kahyapu, Kaana, and Malakoni Villages. Shoreline extraction was performed using Landsat imagery from 1993, 2009, and 2025 after radiometric and geometric corrections, employing the Modified Normalized Difference Water Index (MNDWI) and tidal correction based on MIKE 21 modeling and bathymetric data. Shoreline change rates were calculated using the Digital Shoreline Analysis System (DSAS) with 2,052 transects at 10 m spacing and the parameters Net Shoreline Movement (NSM), End Point Rate (EPR), and Linear Regression Rate (LRR). The results indicate that shoreline retreat due to erosion dominates all study areas. During 1993–2009, average erosion rates ranged from −0.42 to −0.63 m/year and increased markedly during 2009–2025, reaching up to −1.26 m/year in Malakoni Village. Long-term trend analysis for 1993–2025 shows the highest erosion rate in Malakoni (−0.87 m/year), followed by Kaana (−0.56 m/year) and Kahyapu (−0.44 m/year). Accretion occurred only locally and at relatively low rates, insufficient to offset land loss. These findings confirm that the coastal areas of Enggano Island are highly vulnerable to continuous erosion and emphasize the need for integrated and sustainable coastal management strategies.
Co-Authors Anisa putri, Salsabillah Gunawan, Agustin Gusta Gunawan Khairul Amri Makmun Reza, Razali Maulidan, Arsyi Dafa Samsul Bahri