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Journal Articles

Numerical experiments by saturated-unsaturated flow inversion for permeability and boundary conditions of multi-layers aquifer

Inoue, Junya; Masumoto, Kiyoshi*

Doboku Gakkai Rombunshu, A2 (Oyo Rikigaku) (Internet), 74(2), p.I_55 - I_64, 2019/01

Saturated-unsaturated flow inversion program with adjoint method and least norm method was made to estimate saturated hydraulic conductivity and boundary conditions for multi-layers heterogeneous aquifer model. Vertical two dimensional numerical experiments assuming inclined ground consisting of three layers with different permeability were carried out using this program. Some inversion were carried out by changing the coefficient of least norm term to investigate the strength of constraints on the un-known parameters based on the reference value. The result show that it is possible to estimate the unique value of saturated hydraulic conductivity and boundary conditions for multi-layers heterogeneous aquifer model by the method.

JAEA Reports

Study on modeling and analysis of groundwater flow with inverse analysis, 2 (Joint research)

Onoe, Hironori; Yamamoto, Shinya*; Kohashi, Akio; Ozaki, Yusuke; Sakurai, Hideyuki*; Masumoto, Kiyoshi*

JAEA-Research 2018-003, 84 Pages, 2018/06

JAEA-Research-2018-003.pdf:17.44MB

In this study, numerical experiments considered hydrogeological structures, which has high heterogeneity around the Mizunami Underground Research Laboratory and inverse analysis using in-situ data were carried out. The results showed that concentration of hydrogeological structure to be estimated and location of monitoring point is important for application of inverse analysis. Furthermore, it is concluded that inverse analysis using hydraulic response due to pumping test is effective for hydrogeological characterization.

JAEA Reports

Study on modeling and analysis of groundwater flow with inverse analysis (Joint research)

Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*

JAEA-Research 2015-022, 89 Pages, 2016/03

JAEA-Research-2015-022.pdf:27.85MB

In Japan, high-level radioactive waste (HLW) will be emplaced in a stable host rock formation deeper than 300 meters underground for geological disposal. It is important to understand heterogeneous distribution of hydraulic conductivity from the viewpoints of the safety assessment of geological disposal of HLW and construction of underground facilities. Inverse analysis based on the transient data is an efficient technique for estimating the heterogeneous distribution. In this study, numerical experiments with the adjoint state method and the ensemble Kalman filter were carried out in order to understand effective method for application of these inverse analysis. As a result of this study, the capability of each analysis techniques was shown.

Oral presentation

Study of unknown parameter settings using inversion analysis for estimation of hydrogeological characteristics including faults

Takeuchi, Ryuji; Kitagawa, Ayumi*; Masumoto, Kiyoshi*

no journal, , 

It is necessary to give appropriate parameters to construct a groundwater flow model. Inversion analysis is one of the effectivity method for hydrogeological characteristics. However inversion analysis for hydrogeological characteristics has few examples using in-situ data. This paper shows a study of unknown parameter settings using inversion analysis based on the in-situ data.

Oral presentation

Development of method for estimating heterogeneity hydrogeological characteristics of deep underground rock mass using Groundwater inverse modeling

Onoe, Hironori; Takeuchi, Ryuji; Saegusa, Hiromitsu; Masumoto, Kiyoshi*

no journal, , 

Groundwater inverse modeling based on data of pumping test is an efficient technique for estimating heterogeneity hydrogeological characteristics of deep geological environment in fractured crystalline rock. In this study, numerical experiment carried out in order to understand effective application method of groundwater inverse modeling for in-situ investigation.

Oral presentation

Optimization study for numerical inversion analysis of heterogeneous hydraulic properties of rock mass using hydraulic pressure response

Suemitsu, Akinobu*; Masumoto, Kiyoshi*; Onoe, Hironori; Takeuchi, Ryuji

no journal, , 

no abstracts in English

Oral presentation

Inverse analysis methods for characterization of hydrogeological heterogeneity, 1; Numerical experiments with adjoint state method

Masumoto, Kiyoshi*; Onoe, Hironori; Kohashi, Akio; Yamamoto, Shinya*

no journal, , 

no abstracts in English

Oral presentation

Inverse analysis methods for characterization of hydrogeological heterogeneity, 2; Numerical experiments with ensemble Kalman filter

Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Inverse analysis methods for characterization of hydrogeological heterogeneity, 3; The Influence of analysis methodology on the estimated result

Onoe, Hironori; Yamamoto, Shinya*; Masumoto, Kiyoshi*; Kohashi, Akio; Saegusa, Hiromitsu

no journal, , 

no abstracts in English

Oral presentation

Characterization of spatial hydrogeological heterogeneity with ensemble Kalman filter

Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Inverse analysis methods for characterization of hydrogeological heterogeneity

Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Honda, Makoto*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Estimation of hydraulic conductivity in fault zone by inversion of water head data

Ozaki, Yusuke; Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Masumoto, Kiyoshi*

no journal, , 

The objective of this study is verification of feasibility to estimate hydraulic conductivity with inversion method of water head data in fault zone. Hydraulic conductivity in a fault zone is focused on as a target of inversion because the fault would significantly affect a water head field. A series of numerical test with synthetic model is performed under the condition that the number of fault to estimate hydraulic conductivity and the degree of freedom of hydraulic conductivity distribution in a fault zone is different. The information of hydraulic conductivity outside the faults and location of fault is given to the inversion a priori. Our inversion results shows that the accuracy of estimation is improved by constrain to the number of fault to estimate the hydraulic conductivity and freedom of hydraulic conductivity distribution in a fault. In addition, the number of fault to estimate the hydraulic conductivity should be limited for the certain estimation of hydraulic conductivity in all faults.

Oral presentation

A Study of multi-inverse analysis for modeling of hydrogeological heterogeneity of the rock mass

Suemitsu, Akinobu*; Masumoto, Kiyoshi*; Onoe, Hironori

no journal, , 

no abstracts in English

Oral presentation

Study on inverse problem of groundwater flow simulation for optimization of layout of monitoring boreholes

Yamamoto, Shinya*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Joint research of Shimizu corporation and Japan Atomic Energy Agency; Study on modeling and analysis of groundwater flow with inverse analysis

Ozaki, Yusuke; Kohashi, Akio; Onoe, Hironori; Yamamoto, Shinya*; Sakurai, Hideyuki*; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Assessment of groundwater monitoring layout design based on synthetic data assimilation experiment

Yamamoto, Shinya*; Sakurai, Hideyuki*; Onoe, Hironori; Masumoto, Kiyoshi*

no journal, , 

The result of groundwater flow simulation includes the epistemic uncertainty due to the limited hydrogeological data available. Ensemble-based data assimilation scheme can reduce the uncertainty. Additionally, the analysis result of the data assimilation gives useful information for the layout design of the groundwater monitoring. We showed that the layouts determined by the ensemble of the assimilated results in the synthetic experiments are effective in reducing the uncertainty of hydrogeological model.

Oral presentation

Numerical experiments on the inversion of permeability and boundary flow rate of multi-layered unsaturated aquifer

Inoue, Junya; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

A Study on efficient inversion of saturated-unsaturated flow

Inoue, Junya; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

Inverse analysis numerical experiment example of various unknown parameter setting in groundwater model

Masumoto, Kiyoshi*; Inoue, Junya

no journal, , 

no abstracts in English

Oral presentation

Seepage flow analysis of rainwater for The Yotsugi 2 gallery of Ningyo-toge Mine

Inoue, Junya; Kawano, Ryota; Ohara, Yoshiyuki; Tomiyama, Shingo*; Masumoto, Kiyoshi*

no journal, , 

no abstracts in English

Oral presentation

21 (Records 1-20 displayed on this page)