IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Analysis of climate change impacts on runoff and sediment yield in central taiwan
Analysis of climate change impacts on runoff and sediment yield in central taiwan
Numerous typhoons and torrential rains have confronted Taiwan over the years due to climate change. Severe floods and
sediment related disasters have been a norm. What levels of change we can expect for runoff and sediments from climate
change remains critical and is a significant challenge for the disaster prone island. Not only will the challenge be on
disaster mitigation measures, but also the entire water resources management sector. Several models have been
developed and applied; however, most have limited accuracy due to their inability to factor in spatial changes for both
hydrologic and physiographic factors. In the present study, a physiographic soil erosion deposition (PSED) model is
employed to simulate runoff and sediment yields during storm events. The PSED model is integrated with Geographic
Information System (GIS) making it capable of handling enormous data. It also entails rainfall-runoff model and a basin
scale erosion-deposition model. PSED model is validated using discharge and sediment data from Chou-shui river basin
during two typhoon events. Simulated flow hydrographs and sediment transport rates are in good agreement with
observed data. A one-day and a two-day storm for baseline (1980-1999) and climate change scenario A1B (2020-2039)
for 2, 5, 10, 25, 50, 100 and 200-year return are applied to predict future sediment yields. Results indicate that for one-day
storm events, sediment yield decreases for return periods 2, 5 and 10. Sediment yield shows an increasing trend for all
return periods during two-day storm events.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 20/08/2015
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