Study on the hydraulic characteristics of natural levees by field surveys: Case study of the Kokai River, Japan

IF 3.3 2区工程技术 Q2 ENGINEERING, GEOLOGICAL

Soils and Foundations Pub Date : 2025-09-01 DOI:10.1016/j.sandf.2025.101679

Wenyue Zhang , Mai Tabuchi , Tomotaka Yoshikawa , Akihiro Takahashi

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引用次数: 0

Abstract

As compensation for the limited experimental data from the borehole logs, geological knowledge is expected to contribute to better risk assessment of the river levee system. Although natural levees have long been recognized as related to the underseepage risk of river levees, limited quantitative knowledge of hydraulic characteristics is available. Field surveys are conducted at a site along the Kokai River in Japan to reveal the hydraulic characteristics of natural levee sediments. Sounding tests allow us to capture laminar structures in the natural levee sediments. Through in-situ seepage tests, it is found that the silty materials in the natural levee sediments have hydraulic conductivity in the order of around E-06 m/s. Based on the results from the field surveys, numerical spatial hydraulic conductivity models of natural levees are built by applying geostatistical methods, including indicator Kriging and indicator simulations. The methodology in this study shows a possibility of quantifying geological knowledge, which finally contributes to the quantitative risk assessment against underseepage and internal erosion.

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自然堤防水力特性的野外调查研究——以日本Kokai河为例

作为钻孔测井实验数据有限的补偿，地质知识有望有助于更好地对河流堤防系统进行风险评估。虽然自然堤防长期以来被认为与河流堤防的下渗风险有关，但水力特性的定量知识有限。为了揭示天然堤防沉积物的水力特性，在日本Kokai河沿岸进行了实地调查。探空试验使我们能够捕捉到天然堤防沉积物中的层流结构。通过现场渗流试验发现，天然堤防沉积物中的粉质材料具有E-06 m/s左右的水力导率。在野外调查结果的基础上，应用地质统计学方法，包括指标克里格法和指标模拟法，建立了天然堤坝的空间水力导率数值模型。本研究的方法显示了量化地质知识的可能性，最终有助于定量评估地下渗透和内部侵蚀的风险。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Soils and Foundations 工程技术-地球科学综合

CiteScore

6.40

自引率

8.10%

发文量

审稿时长

5 months

期刊介绍： Soils and Foundations is one of the leading journals in the field of soil mechanics and geotechnical engineering. It is the official journal of the Japanese Geotechnical Society (JGS)., The journal publishes a variety of original research paper, technical reports, technical notes, as well as the state-of-the-art reports upon invitation by the Editor, in the fields of soil and rock mechanics, geotechnical engineering, and environmental geotechnics. Since the publication of Volume 1, No.1 issue in June 1960, Soils and Foundations will celebrate the 60th anniversary in the year of 2020. Soils and Foundations welcomes theoretical as well as practical work associated with the aforementioned field(s). Case studies that describe the original and interdisciplinary work applicable to geotechnical engineering are particularly encouraged. Discussions to each of the published articles are also welcomed in order to provide an avenue in which opinions of peers may be fed back or exchanged. In providing latest expertise on a specific topic, one issue out of six per year on average was allocated to include selected papers from the International Symposia which were held in Japan as well as overseas.