Hideki Ueshima

Understanding Hatsukaichi-Shuku post town in the Edo period using old drawing map stored in GPS&PDA

We developed the software for PDA (Personal Digital As-sistant) equipped with GPS (Global Positioning System) to understand Haruskaichi-Shuku post town which prospered during the Edo period (1603~1867). There are very few old, traditional houses remaining in the region, so the town at that time could be experienced by walking through using the corrected old drawing map stored in PDA. People inter-ested in the history and culture of the region have found the technique to be very useful.

The Possibility of Tidal Current Control as Water Quality Remediation in Semi-Enclosed Area Osaka Bay

The objective of this study is to verify the possibility of restraining the formation of low dissolved oxygen water condition in the bottom layer of semi-enclosed bay by tidal current control. Firstly, Omaehama area in Osaka Bay was selected for case study area and detailed environmental investigation was conducted in order to clarify how limited tidal current affected the water quality in the region. Secondly, the feasibility of tidal current control as water quality remediation measures was studied by hydraulic simulation. As a result of this study, it was confirmed that anoxic water condition in semi-enclosed bay could be reduced by tidal current control by enhancing water exchange between the semi-closed area and outer sea and reducing the amount of organic suspended solids.

STUDY OF ENVIRONMENTAL RESTORATION TECHNOLOGIES FOR THE CANAL IN AMAGASAKI PORT EXPERIMENT ON CURRENT CONTROL AND WAETER PURIFICATION USE AMAGASAKI LOCK GATE

In Osaka Bay reclamation has taken place in a variety of forms. Reclamation has made narrow water area where water dose not exchange. And large mount of waste water that discharged into such area decline water quality. On the other hand such area is very important place because people can come in contact with the sea.We made study of environmental restoration technologies for such narrow water area. We made experiment on current control and water purification in Amagasaki canal and made restoration plan.

A STUDY OF THE APPLICATION OF TIDAL CURRENT CONTROL TO ENCLOSED WATERS AND WAYS OF COPING WITH THE BIOTIC COMMUNITIES THAT DEVELOP WITH CHANGES IN FAST CURRENT AREAS

大阪湾等の湾奥部域では埋立によって浅場が消滅し, 人工海岸で囲まれた閉鎖性水域が形成されることで水域環境が悪化している. この様な水域の環境修復には, 流動環境の改善と浅場の浄化機能を回復する技術を複合的に適用することが必要であり, 浅場 (干潟・藻場等) の造成効果については多くの成果が報告されている. 一方, 流動環境の改善技術は構築されつつあるものの, 技術目標である生態系の修復効果に関する研究は未だ緒についたばかりである.本研究では, 大阪湾奥を事例に, 透過型防波堤による流動場の改善効果を示すとともに, 緩傾斜護岸上の付着生物群集を指標に, 生態系修復の観点から当該技術の適用を評価した. その結果流動環境が改善する結果を水理実験から得るとともに, 流動場の変化によって生物の多様度が変化することを室内実験・現地調査結果から得た.