Kazumasa Fujimura

ANALYSIS OF HYDROLOGICAL CYCLE IN THE AZUMA UPRIVER EXPERIMENTAL BASIN

Consciousness of the environment has raised in recent years. Many municipality corporations began conserving and reviving the ecological river front in urban areas which was deteriorated by urbanization. The first procedure for the river front conservation is to increase the ordinary water discharge of urban minor rivers, and the basic study for that is to clarify the hydrological cycle of such river basins.The present paper analyses the hydrological cycle in terms of groundwater runoff, direct runoff and groundwater storage in the Azuma upriver basin during 76 days in 1996, using the daily hydrological model for an urban basin which was presented by Ando et. al.(1982). The simulation resulted in approximation to the observed runoff hydrograph and the groundwater storage which was derived from the measured groundwater level. This paper also predicts the runoff hydrograph in the same period using the same model on the supposition that houses infiltration facilities are set in this basin. This simulation demonstrated that the groundwater runoff was increased and the direct runoff was reduced, that effect on restoring the ordinary water discharge.

Analysis of Hydrological Cycle of Spring in the Musasino Upland and Its Management

Hydrological cycle of the Kokubunji experimental basin in the Musasino upland was studied at the spring in the Kokubunji-manyo garden in relation to the applicability of the hourly concentrated hydrological model and the basin management by means of the houses infiltration facilities. The hydrological model can also be considered the surface infiltration capacity of the pervious area. The analyses were carried out for two years hydrological data in 1992 and 1993, in which the sewer system had been expanded and the inverting wells became scarcely used.The results indicated that the model generally reproduced observed runoff hydrographs, and the model applicability was confirmed. We also predicted the simulated hydrographs of which the assumption that the houses infiltration facilities were introduced, using the above hydrological model. It is found that the houses infiltration facilities are important for managing a basin in respect of the springs conservation.

Stormwat Reurn of Afn alysifs or the Urban Experimteanl Basin in Upland

In recent years, more spatial and temporal rainfall data are presented by progress of climatic observation technology, while the rapid human activities for basins like urbanization caused flooding problems.This paper describes the analysis of stormwater runoff model for the Yabata experimental basin (5.42km2) in urbanized Toshima Upland in Tokyo. And it was considered distributed rainfall data of 5 minutely from 6 autographic raingauges and distinguished infiltration capacity for land use.