Dea Amelia, Yekti Widyaningrum, Anisa Indriawati

Identifikasi Zona Lemah Tanggul Daerah Aliran Sungai (DAS) Bumang Desa Kemuja Menggunakan Metode Geolistrik Resistivitas Konfigurasi Wenner

Introduction

Identifikasi zona lemah tanggul daerah aliran sungai (das) bumang desa kemuja menggunakan metode geolistrik resistivitas konfigurasi wenner. Identifikasi zona lemah tanggul DAS Bumang Desa Kemuja akibat erosi bawah tanah menggunakan metode geolistrik resistivitas konfigurasi Wenner. Temukan kedalaman dan lokasi zona lemah.

Abstract

The Bumang Watershed is a stream of water originating from the Bumang Reservoir in Kemuja Village, Bangka Regency to hold back water from flooding the surrounding rice fields. Since the Bumang watershed embankment was built, the embankment has been damaged in the upper part of the Bumang watershed. The main cause is underground erosion. The erosion caused the embankment foundation to become weak, which was identified as a weak zone. The method used to identify weak zones in the embankment is the Wenner configuration resistivity geoelectric method. The Wenner configuration has good sensitivity to lateral changes compared to other configurations. Field data acquisition consisted of four passes with different electrode lengths and spacings. Based on the 2D cross-section of the subsurface of the Bumang watershed embankment, the weak zone is located on tracks 1, 2, and 3. On track 1 it is at a depth of 2.50 m - 3.19 m and 1.30 m - 3.19 m; on track 2 it is at a depth of 0 m - 2 m; and on track 3 it is at a depth of 0 m - 7 m, 2 m - 4.50 m, and 0 m - 4 m respectively.

Review

This paper presents a timely and relevant investigation into the structural integrity of the Bumang Watershed embankment, a critical piece of infrastructure designed to prevent flooding and protect agricultural lands in Kemuja Village. The authors accurately identify underground erosion as the primary cause of damage, leading to the formation of weak zones within the embankment's foundation. The chosen methodology, the Wenner configuration resistivity geoelectric method, is an appropriate and widely accepted non-invasive technique for subsurface characterization, particularly suited for detecting lateral variations in resistivity that can indicate compromised ground conditions. The study's objective to pinpoint these vulnerable areas is highly significant for proactive embankment maintenance and flood risk management. The methodology is clearly articulated, emphasizing the Wenner configuration's advantages in detecting lateral changes. Field data acquisition involved four distinct passes with varying electrode lengths and spacings, suggesting a methodical approach to achieve comprehensive subsurface coverage. The core finding—the identification and delineation of weak zones within the embankment on tracks 1, 2, and 3—is presented with specific depth ranges. For instance, weak zones were found at depths from 1.30 m to 3.19 m on track 1, 0 m to 2 m on track 2, and extending from 0 m to 7 m on track 3. These detailed findings provide actionable insights for engineers and local authorities to focus their efforts on specific compromised sections of the embankment. In summary, this study offers a valuable contribution by applying a well-established geophysical technique to a pressing engineering problem. The clear identification of weak zones and their depths is a significant outcome, providing a solid basis for future remedial actions. To further strengthen the scientific contribution and practical utility of this work, future iterations or the full paper would benefit from elaborating on the specific resistivity values or ranges that define a "weak zone" and the geological or geotechnical interpretation behind these values. Additionally, a discussion on potential correlations with direct ground truth data, such as boreholes or soil samples, would significantly enhance the robustness and validation of the geoelectric interpretations, thereby informing more precise and cost-effective repair strategies.

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