Wind-induced splash in Class A evaporation pan

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Title:	Wind-induced splash in Class A evaporation pan
Authors:	朱佳仁;Chu, Chia-Ren;Li, Ming-Hsu;Chang, Yu-Feng;Liu, Tsung-Chiang;Chen, Yi-Ying
Contributors:	工學院土木工程學系
Keywords:	Earth sciences;Earth, ocean, space;Evaporation;evaporation pan;Evaporation rate;Evapotranspiration;Exact sciences and technology;Geophysics;Hydrology;seiche wave;Shelters;splash;Water depth;Water loss;Wind effects;Wind speed;wind tunnel experiment;Wind tunnel testing;Wind tunnels
Date:	2012-01-01
Issue Date:	2026-04-21 13:26:36 (UTC+8)
Publisher:	Wiley-Blackwell;Washington, DC: Blackwell Publishing Ltd
Abstract:	摘要： This study investigates the wind‐induced splash in the Class A evaporation pan through a series of wind tunnel experiments. The experimental results revealed that high wind speed can generate seiche wave inside the pan and splash water out of the pan in several minutes. The splash loss increases as the wind speed increases, and the loss rate is at least one order of magnitude greater than the evaporation rate. In other words, the water loss from the pan is not entirely due to evaporation, and the evaporation rates under high wind speeds are over‐estimated. By checking the wind speeds and evaporation rates from a four‐year (2004–2008) field observation collected in northern Taiwan, it is found that the hourly evaporation rate was unusually high when wind speed was larger than 7 m s−1. The splash‐out criterion is set as: hourly average wind speed U ≥ 7 m s−1 and evaporation rate E > 1.64 mm hr−1. The ratio of the splash‐out to the average evaporation rate is 0.75% at this site. In addition, this study examines the influence of the initial water depth in the pan on the evaporation rate. The results demonstrate that, because of the shelter effect caused by the rim of the pan, the evaporation rates for water depth less than 8 cm are lower than that of standard water depth (20 cm) when wind speed U = 4 and 6 m s−1. However, the shelter effect becomes insignificant when wind speed was U = 2 m s−1. Key Points This study investigates the wind‐induced splash in the Class A evaporation pan The water loss from the pan is not entirely due to evaporation The splash loss increased as wind speed increased 其他題名： J. Geophys. Res 出版者： Washington, DC: Blackwell Publishing Ltd 出版日期： 2012-06-16 出處： Journal of Geophysical Research Atmospheres, 2012-06, Vol.117 (D11), p.n/a 資源來源： Wiley Online Library - AutoHoldings Journals 版權： Copyright 2012 by the American Geophysical Union 版權： 2015 INIST-CNRS 版權： Copyright Blackwell Publishing Ltd. Jun 2012 識別號： ISSN: 0148-0227 識別號： ISSN: 2169-897X 識別號： ISSN: 2156-2202 識別號： EISSN: 2156-2202 識別號： EISSN: 2169-8996 識別號： DOI: 10.1029/2011JD016848
Appears in Collections:	[Department of Civil Engineering] journal & Dissertation

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