World Environmental and Water Resources Congress 2020: Extreme Rainfall and Climate Change
Impacts of climate change on extreme rainfall (ER) processes
For the World Environmental and Water Resources Congress 2020, authors Truong-Huy Nguyen, A.M.ASCE and Van-Thanh-Van Nguyen, M.ASCE published the paper entitled “Development of Extreme Rainfall Intensity-Duration-Frequency Relations at Ungauged Locations in the Context of Regional Climate Change.” The paper on extreme rainfall or “ER” and climate change is available from the American Society of Civil Engineers (ASCE, www.asce.org) Library.
Intensity-duration-frequency (IDF) relations to climate change
The authors highlight how numerous approaches exist today to assess the impacts of climate change on extreme rainfall (ER) processes at “gauged” sites — but not at “un-gauged” sites where rainfall is not recorded. Accordingly, the paper proposes new approaches to study precipitation at sites without gauges. The new approaches use intensity-duration-frequency (IDF) relations to climate change projections by different climate models.
World Environmental & Water Resources and Watershed Management
The World Environmental & Water Resources (WEWR) Congress 2020 and the Watershed Management (WM) Conferences, scheduled to take place in Nevada, was cancelled this year due to the pandemic. Next year, the WEWR 2021 Congress will take place in Milwaukee on May 23-27, 2021. As a result, the WEWR Congress 2020 Proceedings and the WM Conference 2020 Proceedings are published in the American Society of Civil Engineers ASCE Library.
Keywords: ASCE, American Society of Civil Engineers, ER, IDF, WEWR, WM, Watershed Management, World Environmental & Water Resources, civil, civil engineers, climate, climate change, climate change projections, climate models, extreme rainfall, intensity-duration-frequency, precip, precipitation, rain, rain gauge, rainfall, water, water management, watershed
Development of Extreme Rainfall Intensity-Duration-Frequency Relations at Ungauged Locations in the Context of Regional Climate Change
By Truong-Huy Nguyen, A.M.ASCE; and Van-Thanh-Van Nguyen, M.ASCE
Abstract
Several approaches have been proposed for assessing the impacts of climate change on extreme rainfall (ER) processes at “gauged” sites but very few methods are available for linking climate change projections to the ERs at an “ungauged” location where rainfall record is limited or unavailable. Therefore, the main objective of this study is to propose an improved method that could be used for constructing reliable rainfall intensity-duration-frequency (IDF) relations at an ungauged site in consideration of climate change projections given by different climate models. The proposed approach consists of: (i) a regional-to-point downscaling to link daily regional rainfalls to daily extreme rainfalls at a given ungauged site, and (ii) a temporal downscaling using the scale-invariance GEV model to link daily-to-sub-daily extreme rainfall distributions at the same location. Results of an illustrative application using the downscaled 25-km regional rainfall data given by the climate simulations of 21 global climate models, and the observed extreme rainfall data from a network of 84 rain gages located in Ontario region (Canada) have indicated the feasibility and accuracy of the proposed approach.
ASCE Subject Headings: Rainfall, Hydrologic data, Project management, Climates, Rainfall intensity, Rainfall frequency, Rainfall duration, Climate change, Ontario, Canada
© 1996–2020, American Society of Civil Engineers
(Source: Nguyen, Truong-Huy, and Van-Thanh-Van Nguyen. “Development of Extreme Rainfall Intensity-Duration-Frequency Relations at Ungauged Locations in the Context of Regional Climate Change.” World Environmental and Water Resources Congress 2020, American Society of Civil Engineers, 14 May 2020, ascelibrary.org/doi/10.1061/9780784482964.018)
(Image source: American Society of Civil Engineers ASCE Library)
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