Tina Asisah, Yekti Widyaningrum, Anisa Indriawati

Identifikasi Kestabilan Tanggul Waduk Desa Kemuja Menggunakan Metode Geolistrik Resistivitas Konfigurasi Wenner

Introduction

Identifikasi kestabilan tanggul waduk desa kemuja menggunakan metode geolistrik resistivitas konfigurasi wenner. Identifikasi kestabilan tanggul Waduk Desa Kemuja pakai metode geolistrik resistivitas Wenner. Pemodelan 2D temukan bagian stabil & tidak stabil, penting untuk pencegahan banjir.

Abstract

Kemuja Village Reservoir is one of the reservoirs located in Kemuja Village, West Mendo District, Bangka Regency, which was built in 2015. On the sides of the Kemuja Village Reservoir, there are embankments that are used to prevent flooding of rice fields. Based on the initial survey, the height of the embankment from the ground is ±2.6 m and the water level is ±1 m above the surface. This study aims to identify the stability of the Kemuja Village reservoir embankment based on 2D modeling using the Wenner configuration resistivity geoelectric method with a spacing of 8 m between electrodes. Based on 2D modeling, the Kemuja Village reservoir embankment has good stability on all tracks, except on track 1 at a depth of 0 m - 1 m with a measurement distance of 10 m - 14 m, track 2 at a depth of 0 m - 1 m with a measurement distance of 36 m - 40 m, track 3 at a depth of 0.5 m - 2 m with a measurement distance of 6 m - 8 m; 0 m - 1.5 m with a measurement distance of 12 m - 16 m and 0 m - 2 m with a measurement distance of 28 m - 30 m, traverse 4 at a depth of 0 m - 1 m with a measurement distance of 8 m - 10 m and 0 m - 2 m with a measurement distance of 44 m - 48 m.

Review

This study presents a relevant application of the geoelectric resistivity method to assess the stability of the Kemuja Village Reservoir embankment, an important piece of infrastructure for flood prevention. The use of a geophysical approach to investigate the subsurface integrity of critical structures such as dams and embankments is a valuable endeavor, providing non-invasive insights into potential hazards. The selection of the Wenner configuration for 2D modeling is an appropriate choice for such shallow to medium-depth investigations, offering a good balance of signal-to-noise ratio and sensitivity for identifying subsurface anomalies. The methodology described, employing 2D resistivity modeling with an 8m electrode spacing, is standard for characterizing geotechnical conditions relevant to embankment stability. The stated objective to identify stability based on this modeling is clear, aiming to provide practical information for the local community. The initial context regarding the embankment's dimensions and water level further helps to frame the scope and significance of the study. This approach holds promise for identifying zones of anomalous material properties that could compromise structural integrity. However, the abstract's presentation of results, while precise in locating problematic zones across different tracks, depths, and distances, significantly lacks the necessary geophysical interpretation. It identifies areas of "good stability" versus specific "problematic" locations but fails to explain *what* geoelectric properties (i.e., specific resistivity values or ranges) define these conditions. A clearer articulation of how resistivity values are correlated with notions of "stability" or potential issues (e.g., low resistivity indicating high saturation/weak material, or very high resistivity suggesting voids/fractures) would greatly enhance the abstract's scientific impact and practical utility. Without this crucial interpretive link, the detailed enumeration of locations, while informative, does not fully convey the underlying physical reasons for the identified instabilities.

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