Oyo Corporation's "Weakness Extraction Technology for River Embankments Using Towed Electrical Resistivity Survey" Registered with NETIS

Oyo Corporation (Headquarters: Chiyoda-ku, Tokyo; President and Representative Director: Hirofumi Amano; hereinafter referred to as "the Company") is pleased to announce that its "Weakness Extraction Technology for River Embankments Using Towed Electrical Resistivity Survey" has been registered with the New Technology Information System (NETIS) of the Ministry of Land, Infrastructure, Transport and Tourism.

NETIS Registration Number

QS-260003-A

Technology Name

Weakness Extraction Technology for River Embankments Using Towed Electrical Resistivity Survey

Registration Date

June 18, 2026

Abstract

This technology relates to embankment investigation. It measures the electrical resistivity values from the ground surface to a depth of approximately 10 meters by towing two types of electrodes. It also allows for continuous and efficient measurement of ground resistivity values, providing a general understanding of ground structures prone to foundation leakage.

Publication

NETIS New Technology Information System

Background

In recent years, the risk of river disasters has increased due to increased rainfall associated with climate change. River embankments, in particular, are long and their foundation ground structures vary from place to place, making it important to efficiently identify weak areas.

While borehole surveys have the advantage of directly confirming soil conditions, they are limited to point investigations and have limitations in understanding wide-area ground structures. Furthermore, conventional electrical resistivity surveys (2D resistivity methods), although effective for understanding ground structures in a planar manner, have faced challenges in terms of cost-effectiveness and construction processes due to the need for electrode installation.

Features of the Technology

This technology uses a towed electrical resistivity survey, combining cable-type and plate-type electrodes, to continuously measure ground resistivity values and efficiently understand ground structures.

Unlike conventional 2D resistivity surveys, it does not require electrodes to be installed in the ground, enabling efficient surveys even for long embankments.

Position information is acquired simultaneously using RTK-GNSS (Real-Time Kinematic high-precision satellite positioning) and visualized as an electrical resistivity distribution map.

By using the Company's developed electrodes in combination, it is possible to understand the resistivity structure from the ground surface to a depth of approximately 10 meters.

Improved accuracy in interpreting soil structures by combining with simple boring.

This enables the extraction of weak areas along the longitudinal direction of the embankment, which can be used for selecting areas for focused inspection and efficient maintenance.

Reference: River Embankment Soundness Evaluation System Ells3D

Image of continuous visualization of embankment ground structure using towed electrical resistivity survey

Future Development

Going forward, the Company will utilize this technology for the maintenance and safety evaluation of river embankments, working to identify areas with high leakage risk at an early stage. Furthermore, we aim to improve the accuracy of risk assessment by accumulating survey data. Additionally, by linking the obtained results with map information, we will visualize weak areas in the longitudinal direction of embankments and use this for selecting areas for focused inspection and countermeasures.

Through these initiatives, we will expand the application of this technology to the maintenance and safety evaluation of river embankments, contributing to the extension of infrastructure lifespan and the reduction of disaster risks.

By integrating our expertise in geosciences, which is our strength, with digital technology, we will contribute to improving the safety of social infrastructure and realizing a sustainable society.

Oyo Corporation Company Profile

Oyo Corporation's management vision is "Best Answers for the Future of People and the Earth." We pursue optimal solutions to difficult challenges through innovation in geoscientific knowledge and digital technology. Based on the foundation of "Creating Geotechnical Engineering," we have deepened our specialized knowledge of geology and ground conditions, contributing to the development of social infrastructure, disaster-resilient urban development, and environmental conservation. Amidst increasing challenges such as the intensification of natural disasters and the aging of infrastructure, we continue to create new value together with all stakeholders for the realization of a sustainable society.

Company Name: Oyo Corporation

Representative: Hirofumi Amano, President and Representative Director

Established: May 2, 1957 (Showa 32)

Capital: 16.174 billion yen

Location: 7 Kanda Mitoshiro-cho, Chiyoda-ku, Tokyo

Business Activities:

- A series of technical services from ground investigation to design and construction supervision for roads, urban planning, civil engineering structures, and building structures.

- Technical services from investigation, analysis, prediction, diagnosis, and evaluation of natural disaster risks such as landslides, cliff collapses, earthquakes, and floods, to countermeasures.

- Technical services from investigation, analysis, prediction, diagnosis, and evaluation of environmental conservation and environmental risks, to countermeasures.

- Collection, processing, and sale of Earth-related information, including ground, environmental, and disaster information.

- Development, manufacturing, sales, leasing, and rental of various measurement equipment, security equipment, software, and systems.

URL: https://www.oyo.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.co.jp