51 research outputs found
EXPERIMENTAL STUDY ON VERTICAL INFILTRATION OF RAIN-WATER
No full textThe infiltration phenomenon is one of the most important processes in hydrologic cycle. Inorder that rain water infiltrates into the ground in unsaturated state, it is necessary that aportion of bulk of air in void of soil or sand is compressed or exchanged by the penetratingwater, because generally there is a groundwater surface or a rock surface underneath the soil orsand stratum. Therefore, the behaviour of the air, in addition to capillary and gravitationalpotentials, is to contribute greatly to the infiltration phenomenon. This paper describes such abehaviour of air during the period of rain-water penetration into unsaturated sands and itscontribution to the infiltration. It is disclosed, as the results obtained experimentally, that ( 1there is a criterion for water ponding on the surface of porous stratum, ( 2) the exchangeabilityof air and water changes largely in this criterion, ( 3 ) a heavy rainfall over the criterionforces to compress the air in sand void, and (4), in the case of existence of groundwatersurface, the air is confined into the regions just under the sand surface and just above thegroundwater surface.The infiltration phenomenon is one of the most important processes in hydrologic cycle. Inorder that rain water infiltrates into the ground in unsaturated state, it is necessary that aportion of bulk of air in void of soil or sand is compressed or exchanged by the penetratingwater, because generally there is a groundwater surface or a rock surface underneath the soil orsand stratum. Therefore, the behaviour of the air, in addition to capillary and gravitationalpotentials, is to contribute greatly to the infiltration phenomenon. This paper describes such abehaviour of air during the period of rain-water penetration into unsaturated sands and itscontribution to the infiltration. It is disclosed, as the results obtained experimentally, that ( 1there is a criterion for water ponding on the surface of porous stratum, ( 2) the exchangeabilityof air and water changes largely in this criterion, ( 3 ) a heavy rainfall over the criterionforces to compress the air in sand void, and (4), in the case of existence of groundwatersurface, the air is confined into the regions just under the sand surface and just above thegroundwater surface
カセン ニ オケル チョウキ リュウシュツ ノ キコウ ニ カンスル ケンキュウ
No full text京都大学0048新制・論文博士工学博士乙第1810号論工博第432号新制||工||193(附属図書館)UT51-46-C1028(主査)教授 石原 安雄, 教授 岩佐 義朗, 教授 石原 藤次郎学位規則第5条第2項該当Kyoto UniversityDFA
A study on the dynamic process of ground water runoff
No full text1972-03-31departmental bulletin pape
A Study of the Fragments of Uigur Text Found in the Fusetsu Nakamura Collection
No full textVery few people know about the Uigur texts collected by Fusetsu Nakamura and no one has ever shed scholastic light on the texts. The author happened to find in the library of Kyoto University a rather large amount of Uigur texts photocopied from the Nakamura Collection. In this paper, the author offers an explanation, a transcription and a translation of some of the fragments, i. e. three leaves of roll manuscripts, I, II, III and two leaves of xylographic prints, IVa, IVb.By doing this, it turned out that fragment I is part of 天地八陽神呪経T’ien-ti-pa-yang-chen-tchou-king and its contents coincide with the Buddhist text 11.130-170, which W. Bang presented in Türkische Turfantexte VII. There are many kinds of Uigur text fragments concerning this Buddhist text but the one the author dealt with here seems very close in character to the one preserved in Berlin.Fragments II, III are both written in verse and the contents are about Kṣamayati.Though it is not clear whether fragments IVa, IVb belong to the text cited above, it is found that the contents of them are both concerned with Sitātapatra-dharānī. IVb is exactly the same as F. W. K. Müller’s Uigurica II, T. III M225 (24).The five leaves dealt with here have come possibly from 王樹枏 Wang Chounan into Nakamura’s possession. They are among the most precious Uigur texts existing in Japan among those not included in the Ōtani Collection.journal articl
STOCHASTIC EVALUATION OF UNCERTAINTY OF FIELD PERMEABILITY TEST IN HETEROGENEOUS AQUIFER
No full textPROBLEMS ON THE APPLICATION OF THE VARIATIONAL PRINCIPLE WITH RESPECT TO THE HYDROLOGIC BEHAVIOUR OF BASINWIDE WATER
No full textStudy on the spatial and temporal behaviors of unconfined groundwater head-field in heterogeneous region
No full text1990-10-31The spatial distribution of hydraulic head, namely "head-field", is estimated from a limited set of observed data, including the uncertainty which caused by both the complexity of groundwater behavior due to the heterogeneity of flow region and the insufficiency of measurement equipments. It is necessary for the precise analysis of the regional groundwater to evaluate quantitatively the uncertainty of head-field. The present study is directed toward tackling this problem from stochastic standpoint. The behavior of unconfined head-field in the heterogeneous flow region due to a rainfall is treated as the physical process in the random field, and the statistical structure of head-field is analyzed based on the physical principles of the subsurface flow. Firstly, the spatial randomness of water-table response to a rainfall is formulated as the head variance, taking the infiltration process in unsaturated zone into consideration. Secondly, the unsteady head variogram after the rainfall is theoretically derived by the perturbation expansion, and the spatial head distributions during the recession process are estimated from a limited set of point data through the geostatistical approach. And lastly, a new criterion for the parameter identification of the regional groundwater model is also proposed, which takes full advantage of the stochastic properties on the uncertainty of actual head behavior.departmental bulletin pape
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