集水區之坡地崩塌與雨量特性及輸砂量間之關係-子計畫:礫石型溪溝崩塌及土石流之降雨特性分析與現地監測(II);The Mechanisms and Monitoring System of Rainfall-Induced Landslides and Debris Flows in Houyenshan Gravelly Gullies

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题名:	集水區之坡地崩塌與雨量特性及輸砂量間之關係-子計畫:礫石型溪溝崩塌及土石流之降雨特性分析與現地監測(II);The Mechanisms and Monitoring System of Rainfall-Induced Landslides and Debris Flows in Houyenshan Gravelly Gullies
作者:	周憲德
贡献者:	國立中央大學土木工程學系
关键词:	土木水利工程;水土資源保育
日期:	2012-12-01
上传时间:	2014-03-17 11:19:33 (UTC+8)
出版者:	行政院國家科學委員會
摘要:	研究期間：10108~10207;The mechanisms of rainfall-induced landslides and debris flows in Houyenshan gravelly gullies will be explored in this proposed study in a three-year period(2011-2014) , by mainly employing field study and experimental work. The field monitoring system will be implemented on an expanding modular base, which includes the rainfall gauge, geophones and infrasound sensors, ultrasound range-detector and video recording system, respectively. Through the monitoring system, we can first examine the threshold rainfall conditions for landslides and debris flows in gravelly gullies. The acoustic signals in response to the magnitude and flow patterns of gravelly debris flows will be analyzed, which are important information for the warning and evacuation processes for the debris flow prone areas. In the first year (2011/8~2012/7): The analysis of hydrological data and geomorphological data of Houyenshan gravelly gullies: This study collects the available rainfall data and geographical data of Houyenshan gullies by using 3D Lidar. A rainfall gauge with data logger will be installed in the first Gully of Houyenshan. The threshold rainfall condition for landslides and debris flows will be evaluated consequently. In the second year (2012/8~2013/7): The acoustic signals and monitoring systems of gravelly debris flows: The acoustic and geophone signals will be analyzed. The acoustic characteristics of landslides and debris flows in the gravelly gullies in response to the flow patterns and magnitudes of the debris flows will be evaluated. The significant frequencies related to the granular and liquid content will be further studied with experimental work. In the third year (2013/8~2014/7): The magnitude of debris flows related to the rainfall and geomorlogical conditions of gravelly gullies: we will expand the field monitoring system with the video recording system. Through the PIV techniques and the information provided by the completed monitoring system, the flow velocity and the discharge of the debris flow events related to the rainfall condition, as well as the geomorphology of the gravelly ravines can be obtained. The relationship between the landslides and the debris flows can be further studied with the aforementioned information and the field survey.
關聯:	財團法人國家實驗研究院科技政策研究與資訊中心
显示于类别:	[土木工程學系 ] 研究計畫

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