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Alviyanda
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Earth & Planetary Sciences Engineering Environmental Science Physics

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Identification of Saltwater Intrusion Distribution in North Padang Cermin Area, Lampung, Indonesia Alviyanda; Anjar Dwi Asterina; Redhatul Irma
Journal of Geoscience, Engineering, Environment, and Technology Vol. 8 No. 4 (2023): JGEET Vol 08 No 04 : December (2023)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2023.8.4.12236

Abstract

The residential areas of North Padang Cermin are mainly located near the coastal area with a high level of groundwater use. Continuous groundwater use could potentially raise saltwater intrusion and lead to a decrease in groundwater quality. The research is conducted to identify the saltwater intrusion spread based on groundwater quality data. Geological observations were carried out to determine the geological conditions of the research area, followed by qualitative and quantitative hydrogeological observations by measuring TDS (Total Dissolved Solid), EC (Electrical Conductivity), pH, temperature, color, and taste. The Herzberg method was used to identify freshwater thickness against seawater intrusion. Hydrogeologically, the research area has four aquifer systems: aquifers with fissure and intergranular flow, aquifers with intergranular flow and wide-distribution productivity, aquifers with fissure and intergranular flow and local distribution, and aquifers with rare groundwater. Groundwater flow has a radial pattern with the most extensive hydraulic gradient with a value of 0.16 m towards the eastern part of the research area. The indications of seawater intrusion were found in the water samples measurement located on the east of the research area with water type of brackish–salty with a TDS value of 1,443 – 3,790 ppm and an EC of 3,000 – 7,580 (μS). Based on the Herzberg method, the distribution of seawater intrusion is estimated to occur at a depth of 36.8 m.
Slope Stability Analysis Throughout Road Around Bukit Barisan Selatan National Park (BBSNP) using Fellenius Method Radityo, Daniel; Bilal Al Farishi; Rezky Naufan Hendrawan; Alviyanda; Imam Ahmad Sadisun
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 3 (2024): JGEET Vol 09 No 03 : September (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.3.14902

Abstract

Bukit Barisan Selatan National Park (BBSNP) is a nature conservation area in Indonesia. The slope stability of the interprovincial roads in BBSNP needs to be assessed for slope stability. This study assesses slope stability using the Fellenius method for the factor of safety calculation. The data utilized consists of geological and structure regional conditions, soil descriptions, soil physical and mechanical properties, water content, liquid limit, plastic limit, plasticity index, specific gravity, soil strength, slope dimensions, and slope weight. The sampling process is conducted un-disturb, followed by laboratory testing. The laboratory tests conducted include soil elasticity and plasticity, soil cohesion, and internal friction angle. The critical slopes at LT-L01 and LT-L23 are compromised due to the low cohesion values, making both slopes susceptible to landslides. The stable slope at LT-R04, LT-L15, LT-L19, and LT-R30 exhibit variability properties across the slopes. The lithology for slope LT-R04 consists of inorganic clay with high plasticity, slopes LT-L15 and LT-R30 have same lithology of silty clay with medium plasticity, while slope LT-L19 has lithology of silty clay with low plasticity. The safety factor values indicate stability due to moderate - high cohesion, contributing to slope stability. Material compaction is required to enhance cohesion values on the slopes. Additionally, need to mitigate water saturation conditions in the slope materials.
Co-Authors Anjar Dwi Asterina Bilal Al Farishi Imam Ahmad Sadisun Radityo, Daniel Redhatul Irma Rezki Naufan Hendrawan