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RISS 인기검색어
- 검색키워드
- 주제어 : Unsaturated hydraulic parameter (검색결과 5 건)
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Hamid Qanza,Abdellatif Maslouhi,Said Abboudi,Hachimi Mustapha,Abderrahim Hmimou 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.11
In soil physics, accurate estimation of hydrodynamic properties is essential for effective groundwater management. Experimentally, determination of these properties in the laboratory or in-situ conditions is difficult step, long and may involve uncertainties significant for the vast majority practice use. Frequently, inverse methods were established to determine accurate parameters in the field scale based on measured soil moisture and hydraulic conductivity over time and depth. These inversions methods involve hydraulic soil-models using adapted optimization algorithms that ensure a best combination of parameters minimizing a cost function. In this work, direct and inverse optimization approaches has been proposed to estimate the effective hydraulic parameters, based on the temporal description of the soil physical and hydraulic parameters using field water content measurements from located in Mnasra area (northwest of Morocco). The Levenberg Marquardt optimization algorithm coupling with the vadose zone model (VZM), numerical code in Fortran, has been used to inverse estimation of hydraulic parameters based on transients soil water content measurements. These uses have been conducted using temporal measurements of soil moisture in depths: 20, 40, 60 and 80 cm. The estimated properties are in good agreement with those measured in-situ. Overall, it was concluded that this technique can greatly widen the range of hydrological problems admissible for inversion and can be used for many applications in hydrologic engineering, either alone or in conjunction with traditional techniques.
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Lin Wang,Chongzhi Wu,Yongqin Li,Hanlong Liu,Wengang Zhang,Xiang Chen 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.12
Probabilistic risk assessment of slope failure evaluates the slope safety in a quantitative manner, which considers the failure probability and failure consequence simultaneously. However, risk assessment of unsaturated slope accounting for spatially variable soil-water characteristic curve (SWCC) model parameter and saturated hydraulic conductivity has been rarely reported. A probabilistic risk assessment approach is proposed in current study for rationally quantifying the unsaturated slope failure risk with the aid of Monte Carlo (MC) simulation. The SEEP/W and SLOPE/W modules contained in Geostudio software are applied to carry out deterministic analysis, where factor of safety (FS) of the unsaturated slope is calculated by Morgenstern–Price method. The spatially variable hydraulic parameters are characterized by their respective random fields that are transferred from the random void ratio field in this study, rather than generating them separately. The proposed approach is subsequently employed to an unsaturated slope example for exploring the influences of spatially variable void ratio. Results show that the unsaturated slope failure risk is considerably affected by the spatially variable void ratio, and the single exponential autocorrelation function (ACF) popularized in geotechnical engineering tends to underestimate the failure risk in the unsaturated slope risk assessment.
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AN ANALYSIS OF THE EFFECT OF HYDRAULIC PARAMETERS ON RADIONUCLIDE MIGRATION IN AN UNSATURATED ZONE
Kim, Gye-Nam,Moon, Jei-Kwon,Lee, Kune-Woo Korean Nuclear Society 2010 Nuclear Engineering and Technology Vol.42 No.5
A One-Dimensional Water Flow and Contaminant Transport in Unsaturated Zone (FTUNS) code has been developed in order to interpret radionuclide migration in an unsaturated zone. The pore-size distribution index (n) and the inverse of the air-entry value ($\alpha$) for an unsaturated zone were measured by KS M ISO 11275 method. The hydraulic parameters of the unsaturated soil are investigated by using soil from around a nuclear facility in Korea. The effect of hydraulic parameters on radionuclide migration in an unsaturated zone has been analyzed. The higher the value of the n-factor, the more the cobalt concentration was condensed. The larger the value of $\alpha$-factor, the faster the migration of cobalt was and the more aggregative the cobalt concentration was. Also, it was found that an effect on contaminant migration due to the pore-size distribution index (n) and the inverse of the air-entry value ($\alpha$) was minute. Meanwhile, migrations of cobalt and cesium are in inverse proportion to the Freundich isotherm coefficient. That is to say, the migration velocity of cobalt was about 8.35 times that of cesium. It was conclusively demonstrated that the Freundich isotherm coefficient was the most important factor for contaminant migration.
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AN ANALYSIS OF THE EFFECT OF HYDRAULICPARAMETERS ON RADIONUCLIDE MIGRATION IN ANUNSATURATED ZONE
GYE-NAM KIM,JEI-KWON MOON,KUNE-WOO LEE 한국원자력학회 2010 Nuclear Engineering and Technology Vol.42 No.5
A One-Dimensional Water Flow and Contaminant Transport in Unsaturated Zone (FTUNS) code has been developed inorder to interpret radionuclide migration in an unsaturated zone. The pore-size distribution index (n) and the inverse of theair-entry value (α) for an unsaturated zone were measured by KS M ISO 11275 method. The hydraulic parameters of theunsaturated soil are investigated by using soil from around a nuclear facility in Korea. The effect of hydraulic parameters onradionuclide migration in an unsaturated zone has been analyzed. The higher the value of the n-factor, the more the cobaltconcentration was condensed. The larger the value of α-factor, the faster the migration of cobalt was and the moreaggregative the cobalt concentration was. Also, it was found that an effect on contaminant migration due to the pore-sizedistribution index (n) and the inverse of the air-entry value (α) was minute. Meanwhile, migrations of cobalt and cesium arein inverse proportion to the Freundich isotherm coefficient. That is to say, the migration velocity of cobalt was about 8.35times that of cesium. It was conclusively demonstrated that the Freundich isotherm coefficient was the most important factorfor contaminant migration.
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이정환,조현진,정재열,정해룡,윤정현,Lee, Jeong-Hwan,Cho, Hyun-Jin,Cheong, Jae-Yeol,Jung, Haeryong,Yoon, Jeong Hyoun 한국지하수토양환경학회 2016 지하수토양환경 Vol.21 No.1
Capillary barriers, consisting of relatively fine-over-coarse materials, have been suggested as an alternative to traditional compacted soil covers. So, We were analysed to capillary barrier effect according to five cases of multi-layer cover systems. Water balance simulation was conducted with unsaturated flow model HELP to assess unsaturated hydraulic parameters such as hydraulic conductivity, climate affecting the performance of capillary barriers. Simulation were conducted for 5 Cases in the Ulsan area. Result of simulation indicated that three cases was formed unsaturated condition and capillary barrier effect.
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