Article Per Year (5 Year)
p-Index From 2020 - 2025
0.444
P-Index
This Author published in this journals
All Journal Jurnal Techno Bahari
DewI, Retno Syahriawati
Unknown Affiliation
Electrical & Electronics Engineering Energy Mechanical Engineering Transportation

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Analisa Kerusakan Pipa Bawah Laut Akibat dari Kejatuhan Jangkar Aldara, Desta Rifky; DewI, Retno Syahriawati; Mulananda, Arisessy Maharani
Techno Bahari Vol 9 No 2 (2022)
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v9i2.215

Abstract

Subsea pipelines have several risks that can cause damage to the surrounding environment if damage occurs. Several factors can cause subsea pipeline failure, such as: third party errors, corrosion, design errors, and operational errors. Literature and historical reviews of subsea pipeline failures and incidents indicate that third party factors are responsible for 38% of subsea pipeline failures. Common factors from the category of third party errors that can cause pipeline failure include: fishing activities, commercial ship activities (emergency anchoring, dragged anchor, dropped containers, and ship sinking), and ship construction activities. The main focus of this assessment is the analysis of damage to the subsea pipeline caused by the anchor fall. Damage calculations based on the DNVGL RP F107 standard were compared with simulations using the FEM application. Based on the damage analysis carried out, the underwater pipeline was damaged in the protective concrete layer and experienced dents. Therefore, external protection using the gravel buried method is recommended to protect subsea pipelines from falling anchors. The total investment value required for the installation of the shield is Rp. 4,853,181,463.
Kajian Transport Kontaminan Konservatif dan Non Konservatif di Air Tanah Dangkal dengan Model Analitik Dewi, Retno Syahriawati
Techno Bahari Vol 10 No 1 (2023)
Publisher : Politeknik Negeri Madura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52234/tb.v10i1.224

Abstract

Solid waste that is not managed properly can be a threat to the environment, such as groundwater contamination caused by leachate. Leachate is the liquid released from landfill due to biological degradation and infiltration rainfall. This research purpose to determine the contaminant transport of chloride (conservative) and COD (non-conservative) contaminants from leachate and to predict groundwater quality for a period used the development of Domenico's analytical model. The samples used for this research were samples of leachate, groundwater, and soil taken around the TPA Kopiluhur, Cirebon City. The leachate quality for the chloride parameter was 52.8 mg/L and the COD parameter was 3200 mg/L. The results of two-dimensional Domenico's analytical model explained that the spread of chloride contaminants reached ± 350 meter in the transverse direction and ± 2500 meter in the longitudinal direction, while the COD contaminants reached ± 150 meter in the transverse direction and ± 150 meter in the longitudinal direction. Prediction of groundwater quality for a period time used one-dimensional of Domenico's analytical model. The result of one-dimensional simulation explained that contaminants concentration will be increases with increasing landfill age. When landfill age reaches 50 years and 80 years, chloride concentrations in five wells of resident are still on the threshold of quality standard while COD concentrations in SAT 1 and SAT 2 exceed the quality standard based on PP No 22 of 2021 for Class 1.
Co-Authors Aldara, Desta Rifky Mulananda, Arisessy Maharani