Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Jan 15, 2021
Richards' partial differential equation normally governs water flows in soil. It can be utilized ... more Richards' partial differential equation normally governs water flows in soil. It can be utilized to investigate water infiltration in the soil. A case study of the Haverkamp's water infiltration simulation into Yolo Light Clay was carried out. A common practice to change between the hydraulic functions (from Haverkamp to van Genuchten) could cause a discrepancy in the simulation results. Hence, the first objective is to modify van Genuchten's equations to reproduce the water infiltration result that was obtained using the Haverkamp constitutive functions. The method used was able to recreate water infiltration by increasing the fitting parameters of the van Genuchten constitutive functions. The second objective is to identify the mechanism governing the flow of water. The soil water diffusivity and the hydraulic conductivity were responsible for the flux of water in the soil. The Richards' equation was discretized using a finite difference method, and the algebraic solution was coded into Simply Fortran 2008.
Frost damage in vineyard is severe. In this study, we use the concept of causal modeling proposed... more Frost damage in vineyard is severe. In this study, we use the concept of causal modeling proposed in our previous study to predict the frost in vineyards located in Hokkaido, Japan. It is possible to use a trained model for forecasting frost in the next few hours based on recent observations of temperature and vapor pressure. Several methods of input granulation are examined, and it is verified that methods with exponential moving average outperform those with simple moving average in terms of F1 measure.
Frontiers in artificial intelligence and applications, Nov 24, 2022
Frost causes damage to crops. Predicting the frost occurrence in advance is highly valuable for p... more Frost causes damage to crops. Predicting the frost occurrence in advance is highly valuable for practitioners taking possible frost-prevention measures. In our previous study, we have applied machine learning to forecast frost occurrence using two methods. To better support user with a potential trend of frost occurrence in a future period, we propose an integrated system of frost forecast taking the advantages of the two methods.
To effectively protect plants from frost damage, an early alarm of frost can be helpful for growe... more To effectively protect plants from frost damage, an early alarm of frost can be helpful for growers. Frost is a localized phenomenon and can be quite variable across a small area, so predictive models developed with local data are preferred. As a climate phenomenon the occurrence of frost is closely related to multiple environment factors including temperature, humidity, radiation and more. This article proposes construction of predictive models using support vector machine approach to capture possible causal relation between these factors and frost. Such models trained with specific local data are expected to help frost forecast in a few hours ahead in the local area. Problem analysis, modeling methodology, and model ensemble are discussed, and experiments with real data are provided.
In March 2011, radioactive materials, including radiocesium (Cs), were leaked into the surroundin... more In March 2011, radioactive materials, including radiocesium (Cs), were leaked into the surrounding environment, including forests, farmlands, and houses, during the Fukushima Daiichi Nuclear Power Plant accident. To reduce external gamma-ray exposure, Cs deposited on houses and the surrounding area within a 20 m radius from the houses was removed. However, areas beyond the 20 m distance, at a higher elevation on the backyard hill slope, remained uncleaned. We were concerned that surface runoŠ might move the remaining Cs at the higher elevation on the backyard mountain slope down on the slope surface to the lower elevation, where Cs had been removed. The objective of this study was to investigate how Cs was transported on the slope after its removal. On the south-facing slope located in the north of the houses in the Iitate Village, Fukushima Prefecture, topsoil with a litter was collected several times a year, between April 2015 and February 2019. The
Journal of the Japanese Association for Petroleum Technology
Real time measurements of volumetric water content in sea oor sediments by the Time Domain Re ect... more Real time measurements of volumetric water content in sea oor sediments by the Time Domain Re ectometr y TDR with gravity coring in the surface methane hydrate sur vey
Journal of the Japanese Association for Petroleum Technology
Relationship between atmospheric CH 4 concentration above sea surface and gas plumes from sea oor... more Relationship between atmospheric CH 4 concentration above sea surface and gas plumes from sea oor along the eastern margin of Japan sea and around Hokkaido
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, Jan 15, 2021
Richards' partial differential equation normally governs water flows in soil. It can be utilized ... more Richards' partial differential equation normally governs water flows in soil. It can be utilized to investigate water infiltration in the soil. A case study of the Haverkamp's water infiltration simulation into Yolo Light Clay was carried out. A common practice to change between the hydraulic functions (from Haverkamp to van Genuchten) could cause a discrepancy in the simulation results. Hence, the first objective is to modify van Genuchten's equations to reproduce the water infiltration result that was obtained using the Haverkamp constitutive functions. The method used was able to recreate water infiltration by increasing the fitting parameters of the van Genuchten constitutive functions. The second objective is to identify the mechanism governing the flow of water. The soil water diffusivity and the hydraulic conductivity were responsible for the flux of water in the soil. The Richards' equation was discretized using a finite difference method, and the algebraic solution was coded into Simply Fortran 2008.
Frost damage in vineyard is severe. In this study, we use the concept of causal modeling proposed... more Frost damage in vineyard is severe. In this study, we use the concept of causal modeling proposed in our previous study to predict the frost in vineyards located in Hokkaido, Japan. It is possible to use a trained model for forecasting frost in the next few hours based on recent observations of temperature and vapor pressure. Several methods of input granulation are examined, and it is verified that methods with exponential moving average outperform those with simple moving average in terms of F1 measure.
Frontiers in artificial intelligence and applications, Nov 24, 2022
Frost causes damage to crops. Predicting the frost occurrence in advance is highly valuable for p... more Frost causes damage to crops. Predicting the frost occurrence in advance is highly valuable for practitioners taking possible frost-prevention measures. In our previous study, we have applied machine learning to forecast frost occurrence using two methods. To better support user with a potential trend of frost occurrence in a future period, we propose an integrated system of frost forecast taking the advantages of the two methods.
To effectively protect plants from frost damage, an early alarm of frost can be helpful for growe... more To effectively protect plants from frost damage, an early alarm of frost can be helpful for growers. Frost is a localized phenomenon and can be quite variable across a small area, so predictive models developed with local data are preferred. As a climate phenomenon the occurrence of frost is closely related to multiple environment factors including temperature, humidity, radiation and more. This article proposes construction of predictive models using support vector machine approach to capture possible causal relation between these factors and frost. Such models trained with specific local data are expected to help frost forecast in a few hours ahead in the local area. Problem analysis, modeling methodology, and model ensemble are discussed, and experiments with real data are provided.
In March 2011, radioactive materials, including radiocesium (Cs), were leaked into the surroundin... more In March 2011, radioactive materials, including radiocesium (Cs), were leaked into the surrounding environment, including forests, farmlands, and houses, during the Fukushima Daiichi Nuclear Power Plant accident. To reduce external gamma-ray exposure, Cs deposited on houses and the surrounding area within a 20 m radius from the houses was removed. However, areas beyond the 20 m distance, at a higher elevation on the backyard hill slope, remained uncleaned. We were concerned that surface runoŠ might move the remaining Cs at the higher elevation on the backyard mountain slope down on the slope surface to the lower elevation, where Cs had been removed. The objective of this study was to investigate how Cs was transported on the slope after its removal. On the south-facing slope located in the north of the houses in the Iitate Village, Fukushima Prefecture, topsoil with a litter was collected several times a year, between April 2015 and February 2019. The
Journal of the Japanese Association for Petroleum Technology
Real time measurements of volumetric water content in sea oor sediments by the Time Domain Re ect... more Real time measurements of volumetric water content in sea oor sediments by the Time Domain Re ectometr y TDR with gravity coring in the surface methane hydrate sur vey
Journal of the Japanese Association for Petroleum Technology
Relationship between atmospheric CH 4 concentration above sea surface and gas plumes from sea oor... more Relationship between atmospheric CH 4 concentration above sea surface and gas plumes from sea oor along the eastern margin of Japan sea and around Hokkaido
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Papers by Kosuke Noborio