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K. Ohgushi
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GEOSLICIER AND ITS APPLICATION FOR SOIL STRATA ANALYSIS T. Harianto; T. Hino; R. Jia; K. Ohgushi; T. Ichihara
Lowland Technology International Vol 15 No 1, June (2013)
Publisher : International Association of Lowland Technology

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Many "nogoshi" i.e, lower sections of the river bank that allow upstream floodwater overflow, have been built on the Jobaru River in Kyushu Island, Japan. The soil strata in the floodpain adjacent to the Yago Nogoshi of the Jobaru River were studied using a Geoslicier. The sedimentary facies and the sedimentary ages of the soil strata were determined using Geoslicier samples. The sedimentary environmental of the test site was defined, and soil strata formed by sediments during large floods were identified. The layers below ground level (G.L.) -1.50 to -1.70 m are river channel deposits, and the layers above G.L. -1.50 to -1.70 m are back marsh deposits. The result of radiocarbon dating show that the river channel deposits were formed before AD 1500. The lower layers of the back marsh deposits, which contain a considerable quantity of plan roots, were formed at approximately AD 1600. The upper layers of the back marsh deposits, which contain a small quantity of plant roots, were formed after AD 1600. The time of artificial land alterations was deduced based on the results of the sample analyses.
WATER QUALITY MONITORING OF THE ARIAKE SEA BY REMOTE SENSING AND UTILIZATION OF FIELD OBSERVATION K. Ohgushi; H. AR; T. Y. Gan
Lowland Technology International Vol 6 No 2, Dec (2004)
Publisher : International Association of Lowland Technology

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A remote sensing is one of the most powerful solution for estimating water quality in wide water bodies effectively. The earth observation stellites Landsat have been observing the land and ocean from space for a long time with consistent specification plus new additional technology. In this paper, a water quality in the Ariake Sea, Japan is estimated by using Landsat-TM nad ETM+ images with field observation. The models for water salinity and cholorophyll-a concentration are developed by regression analysis like the transparancy and water temperature models, and they are also validated by other observed data. In order to understand characteristic of water quality in the Ariake Sea. a continuous observation was also executed at a fixed observation tower in the bay for about five months. A GIS technique was also applied to consider spatial and seasonal characteristic of water environment of this bay.
A Study on Jobaru River Basin Management by Numerical Simulations of Flooding and Sediment Deposition with Field Survey K. Ohgushi; H. Nakashima; T. Hino; T. Morita; T. Jansen
Lowland Technology International Vol 18 No 1, June (2016)
Publisher : International Association of Lowland Technology

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River basin management in Japan in the early modern period can be considered as providing a prototype of possible countermeasures for present-day flood exceeding the design level. The river basin management in the Saga region of Japan was established by Naritomi Hyogo in the early Edo era. This study evaluates characteristics of river basin management in Jobaru River Basin located in the eastern Saga Plain using numerical simulations and geotechnical surveys. A flood flow of Jobaru River was calculated using a 1-D flow numerical simulation. Overflow discharges from Nokoshi, open levee and no-levee intervals are estimated and these discharges are specified as boundary conditions for quasi 3-D inundation flow simulations. 2-D sediment transport by water flow is also simulated. A Geoslicer is used for field surveys that uncover clues of how the sediment has been deposited in the past. The ages of the sampled stratums was measured by using radiocarbon dating methods. The classified sediments columns and estimated ages of the stratum by the radiocarbon dating correspond to the simulated flood flow behavior in the retarding basin after overflow from the Nokoshi and open levee. Moreover, No.1 open levee reproduced by the geotechnical survey's result is used for the flow simulation successfully.
Co-Authors H. AR H. Nakashima R. Jia T. Harianto T. Hino T. Ichihara T. Jansen T. Morita T. Y. Gan