Discharge of landslide-induced debris flows: case studies of Typhoon Morakot in southern Taiwan

Chen, J.-C.; Chuang, Mo‐Hsiung

doi:10.5194/nhess-14-1719-2014

Cited by 19 publications

(12 citation statements)

References 25 publications

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“…The first step of this method is to estimate the peak discharge, Q. We used the method illustrated by Chen and Chuang (2014). The peak discharge of debris flow is proportional to the water flow peak discharge, Q w , fed by rainfall in the watershed catchment.…”

Section: Methodsmentioning

confidence: 99%

Protecting highway bridges against debris flows using lateral berms: a case study of the 2008 and 2011 Cheyang debris flow events, China

Qiu

Huang

et al. 2017

Geomatics, Natural Hazards and Risk

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Section: Methodsmentioning

confidence: 99%

Protecting highway bridges against debris flows using lateral berms: a case study of the 2008 and 2011 Cheyang debris flow events, China

Qiu

Huang

et al. 2017

Geomatics, Natural Hazards and Risk

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“…Typhoon Morakot brought extreme rainfall and caused many hazards, such as landslides, debris flows, and floods, in southern and central Taiwan [18]. For such extreme rainfall, most flow discharge stations could not work and, as a result, there was no recorded data for the Gao-ping river in southern Taiwan.…”

Section: Estimation Of Peak Flow Discharge During Typhoon Morakotmentioning

confidence: 99%

Estimating Peak Flow-Discharge During Extreme Rainfall Events for the Gao-Ping River, Taiwan

CHEN

Yang

Ching

2016

WIT Transactions on State-of-the-Art in Science and Engineering

Self Cite

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Typhoon Morakot struck central and southern Taiwan on August 8, 2009. The high intensity and accumulation of rainfall induced floods, landslides and debris flows. During Typhoon Morakot, the flood level was beyond the design limit of many river embankments in southern Taiwan. It is, therefore, desirable to estimate the peak flow-discharge for similar extreme rainfall events in future. In this study, the destructive flood in the Gao-ping river in southern Taiwan, caused by Typhoon Morakot, was selected as an area for case analysis. First, hydrological and geomorphological data for historical typhoons together with rainfall data were collected and analyzed. Next, the rational method, combined with a number of equations, was proposed to estimate peak flow-discharges in the river produced by extreme rainfall events. The estimated peak flow-discharges of historical events were then compared with the observation data acquired from stream gauge stations and previous studies. The results showed that the proposed method is able to estimate the flow-discharge in the Gao-ping river with reasonable accuracy if the flow rate of interest is greater than 5000 cms or the return period of interest is more than 100 years. It could, therefore, be used to determine the peak flow-discharge for extreme rainfall events.

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“…A detailed overview of this method was illustrated by Chen and Chuang (2014). The first step is to determine the water-flow peak discharge Q w fed by the rainfall in the watershed catchment.…”

Section: Appendixmentioning

confidence: 99%

“…where c V is the volumetric sediment concentration of debris-flow mass (commonly no more than 0.65 according to Wrachien and Mambretti [2011], and 0.48 to 0.55 according to Chen and Chuang [2014]). Equation (A4) indicates that debris-flow peak discharge is regarded as the amplification of water-flow discharge due to the involvement of large amount of solid debris (see Figure A1).…”

Section: Appendixmentioning

confidence: 99%

Assessing entrainment of bed material in a debris‐flow event: a theoretical approach incorporating Monte Carlo method

Han

Chen

et al. 2015

Earth Surf Processes Landf

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Entrainment of underlying bed sediment by a debris flow can significantly increase the debris‐flow magnitude. To study this phenomenon, a theoretical approach to assessing bed‐sediment entrainment is presented. The approach is based on a static approximation that bed‐sediment entrainment occurs when the shearing stress of the flow is sufficiently high to overcome the basal resistance of the bed sediment. In order to delineate erodible zones in a channel, we analyze the critical condition of this static equilibrium model, and subsequently propose a new concept of a critical line to detect the entrainment reaches in a channel. Considering the spatial and temporal uncertainties of the input parameter, the approach is further incorporated within a Monte Carlo method, and the distribution of entrainment zones and post‐entrainment volumes can be analyzed. This approach is illustrated by back‐analysis of the 2010 Yohutagawa debris‐flow event, Japan. Results from 10 000 trials of Monte Carlo simulation are compared with the in situ surveys. It is shown that the present approach can be satisfactorily used to delineate erodible zones and estimate possible entrainment volume of the event. Discussion regarding the sensitivities and limitations of the approach concludes the paper. Copyright © 2015 John Wiley & Sons, Ltd.

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Discharge of landslide-induced debris flows: case studies of Typhoon Morakot in southern Taiwan

Cited by 19 publications

References 25 publications

Protecting highway bridges against debris flows using lateral berms: a case study of the 2008 and 2011 Cheyang debris flow events, China

Protecting highway bridges against debris flows using lateral berms: a case study of the 2008 and 2011 Cheyang debris flow events, China

Estimating Peak Flow-Discharge During Extreme Rainfall Events for the Gao-Ping River, Taiwan

Assessing entrainment of bed material in a debris‐flow event: a theoretical approach incorporating Monte Carlo method

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