All issues
Volume 24, Issue 2
Displaying 1-3 of 3 articles from this issue
- |<
- <
- 1
- >
- >|
Original research article
-
Kozo FUKUNARI, Katsuji SHIRAI, Katsuhide YOSHIKAWAArticle type: Original Article
2011 Volume 24 Issue 2 Pages 85-98
Published: March 05, 2011
Released on J-STAGE: March 25, 2011
JOURNAL FREE ACCESSThe riverbed has degraded due to river channel improvement, gravel excavation and other factors, and this has greatly affected flood control, water utilization and the river environment. As such, it is important to clarify the current state of the sediment budget and riverbed variation to verify these factors and maintain stable river channel management in the future.
Taking the Tone River system as an example, this paper verifies the current state of the sediment budget and riverbed variation using specific data, taking the history of river channel improvement and sediment collection into consideration. Through this process, this study attempts to clarify the issues caused by riverbed variation involved in actual river channel management, as well as discussing the measures necessary for maintaining the flood control, water usage and environmental functions of rivers so that the river channels can continue to be managed in a sustainable and stable manner.View full abstractDownload PDF (1327K) -
Hiromi SUZUTA, Takashi KINOSHITA, Katsuji SHIRAI, Katsuhide YOSHIKAWAArticle type: Original Article
2011 Volume 24 Issue 2 Pages 99-109
Published: March 05, 2011
Released on J-STAGE: March 25, 2011
JOURNAL FREE ACCESSSome information made available to the public, such as inundation records and the map of expected flooded areas, can be used to estimate flooding. But they only apply to specific conditions. In that regard such information is objective but dry. It is not known to all the people living in the flood plain or administrative officials addressing river disasters. Focusing on geomorphologic approaches, this study analyzed the Tone River basin and proposes a method of estimating the extent and depth of inundation. The results were verified by being compared with the inundation records of Typhoon Kathleen of 1947. This was aimed at allowing citizens, including children, to easily understand the inundation risks of flooding. The three-dimensional display of the landform classification map for flood control was developed for the purpose of making the information on landform classification and ground height recognizable at a glance. This will make it easier for people uneducated about such maps to understand the inundation risks and other risks of the flood plain.
We also discuss measurements of true height to estimate levee breakage resultant from levee overtopping, the cause of most cases of levee breakage leading the river water to flood.View full abstractDownload PDF (1314K) -
Shinya MITSUISHI, Toshihisa OZEKI, Tetsuya SUMIArticle type: Original Article
2011 Volume 24 Issue 2 Pages 110-120
Published: March 05, 2011
Released on J-STAGE: March 25, 2011
JOURNAL FREE ACCESSThe efficient and effective operation of existing dams is highly required since the frequency of the phenomenon of extreme rainfall events have increased due to climate change. In contrast, the construction of additional flood control facilities has been lagging behind schedule due to various constraints. This paper studied the applicability of a rational flood control method aiming at minimizing downstream damages including extreme floods, while utilizing rainfall prediction by the Weather Research and Forecasting model (WRF), the accuracy of which has been significantly improved recently. This paper also discusses the suitable handling of errors in rainfall prediction by the WRF and the other possible improvements to achieve more effective dam operation.View full abstractDownload PDF (1307K)
- |<
- <
- 1
- >
- >|