Thian Yew Gan

University of Alberta

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Co-Authors

Roger G. Barry

University of Colorado Boulder

Xuezhi Tan

Sun Yat-sen University

Chun‐Chao Kuo

Government of British Columbia

Adam Kenea Gobena

BC Hydro (Canada)

Shuyu Zhang

Southern University of Science and Technology

Ernst Kerkhoven

University of Alberta

Shereif H. Mahmoud

University of Alberta

Mesgana Seyoum Gizaw

University of Alberta

Yongqin David Chen

Chinese University of Hong Kong

Bingjun Liu

Sun Yat-sen University

Cooperative Institutions

University of Alberta

Sun Yat-sen University

Chinese Academy of Sciences

Wuhan University

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering

NOAA National Weather Service

Southern University of Science and Technology

Northwest A&F University

National Oceanic and Atmospheric Administration

Ministry of Water Resources of the People's Republic of China

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Automatic Calibration of Conceptual Rainfall‐Runoff Models: Optimization Algorithms, Catchment Conditions, and Model Structure

Water Resources Research (1996)

Thian Yew Gan Getu Fana Biftu

From 32 CRR‐catchment cases (combinations from four conceptual rainfall‐runoff models (CRR) and eight catchments) calibrated with either two or three optimization methods, (1) the shuffle complex evolution method (SCE‐UA), (2) the multiple start Simplex (MSX), and (3) the local Simplex, it seems that all three methods produced parameter sets of comparable, local‐optimum quality. Even with comparable performance among the models, some parameter values derived by the three optimization methods for the same CRR‐catchment cases are surprisingly different from each other. In addition, parameter sets of SCE‐UA or MSX, which often produce marginally better results than the local Simplex at the calibration stage, could end up with worse results at the validation stage. Apparently, given the inherent limitations of calibration data, model inadequacies, and identifiability problems, it is impossible to achieve global convergence in the parameter search. However, other than those for dry catchments such as Ihimbu or Bird Creek, the parameter sets obtained are generally feasible. Both SCE‐UA and the local Simplex are viable optimization tools, while MSX is inefficient computationally. SCE‐UA can complete the parameter search in one run, while the local Simplex often requires multirun operations to get good results.

Identifiability

Simplex

10.1029/95wr02195

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Citations (230)

Developing a gross primary production model for coniferous forests of northeastern USA from MODIS data

International Journal of Applied Earth Observation and Geoinformation (2013)

Nasreen Jahan Thian Yew Gan

Primary (astronomy)

10.1016/j.jag.2013.03.006

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Citations (7)

Trends in air temperature and precipitation for Canada and north‐eastern USA

International Journal of Climatology (1995)

Thian Yew Gan

Abstract Using the univariate, non‐parametric, Kendall's test for monotonic trends from the 1949 to 1989 period, monthly maximum, minimum, average temperature, and precipitation data of some carefully selected stations in Canada and north‐eastern USA, it is found that western Canada for the past 40 years has experienced significant warming in January and March, and to a limited extent in April, May, and June, but virtually no warming trend was detected in eastern Canada and north‐eastern USA. Instead, some cooling trends were found, particularly in October. The analysis on the annual cycle of temperature data also shows the seasonal and regional nature of warming and cooling trends. Unlike temperature, no obvious trend is found in the precipitation data, but on the whole there are more stations (up to 10 per cent) with upward trends (increase in precipitation) during springs and summers. A bivariate test was used to detect a shift in the mean of precipitation series with respect to maximum temperature series but no obvious indication of such a shift was detected.

Trend analysis

Univariate

Maximum temperature

Mean radiant temperature

10.1002/joc.3370151005

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Citations (51)

The effectiveness of composite lining systems in controlling the leakage of leachate from sanitary landfills to groundwater

Environmental Monitoring and Assessment (1991)

Thian Yew Gan Gerry Friesen

Geotextile

Geomembrane

10.1007/bf00401311

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Citations (3)

Hydrologic sensitivities of the Sacramento-San Joaquin River Basin, California, to global warming

Water Resources Research (1990)

Thian Yew Gan

San Joaquin

10.1029/89wr01379

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Citations (20)

Non-stationary analysis of the frequency and intensity of heavy precipitation over Canada and their relations to large-scale climate patterns

Climate Dynamics (2016)

Xuezhi Tan Thian Yew Gan

10.1007/s00382-016-3246-9

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Citations (35)

Five centuries of reconstructed streamflow in Athabasca River Basin, Canada: Non-stationarity and teleconnection to climate patterns

The Science of The Total Environment (2020)

Yenan Wu Thian Yew Gan Yuntong She Chong‐Yu Xu Haibin Yan

Teleconnection

Dendroclimatology

Forcing (mathematics)

Flood forecasting

10.1016/j.scitotenv.2020.141330

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Citations (13)

Effects of Climate Change on the Surface-Water Management of the South Saskatchewan River Basin

Journal of Water Resources Planning and Management (2012)

Zahidul Islam Thian Yew Gan

The Modified Interaction Soil Biosphere Atmosphere (MISBA) model, the Water Resources Management Model (WRMM) of Alberta Environment, and the Irrigation District Model (IDM) of Alberta Agriculture Food and Rural Development were used to assess the future outlook of water resource management of the South Saskatchewan River Basin (SSRB) of Alberta under the potential impacts of climate change. Using the SSRB hydrometeorological base data from 1928–1995, potential effects of climate change on the SSRB for 2010–2039, 2040–2069, and 2070–2099 were simulated by MISBA, IDM, and WRMM with the climate scenarios projected by four general circulation models forced by emissions reported by the Intergovernmental Panel on Climate Change. Under these climate projections, MISBA simulated a significant decrease in the mean annual average and mean annual maximum streamflows over selected nodes within the SSRB; the irrigation water demand projected by IDM is expected to increase progressively over the 21st century; and WRMM simulated changes to the number of deficit years out of 68 years (1928–1995) to specific water sectors of the SSRB. Overall, according to the projections of WRMM, the instream flow requirement of SSRB will either not be affected or will only be marginally affected, but irrigation districts will be progressively affected by climate change. The senior private irrigation users will not be affected by climate change in 2010–2039 and will only be marginally affected in 2040–2069 and 2070–2099. In contrast, junior and future private irrigation users are projected to be progressively affected by climate change. On the other hand, for nonirrigation consumptive uses, all senior, junior, and future licenses may be significantly affected by climate change.

10.1061/(asce)wr.1943-5452.0000326

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Citations (17)

Glaciers and ice caps

Cambridge University Press eBooks (2022)

Roger G. Barry Thian Yew Gan

The word “Gletscher” (glacier) first appeared on a map of the Alps in 1538, but the term “Ferner” for old snow was used in the Tyrol in 1300 and “Kees” (ice) in 1533 and on a map from 1604 (Klebelsberg, 1948, pp. 1–2).

Ice caps

10.1017/9781108767262.005

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Citations (0)

Recent changing characteristics of dry and wet spells in Canada

Climatic Change (2021)

Yang Yang Thian Yew Gan Xuezhi Tan

Quantile

Wet season

10.1007/s10584-021-03046-8

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Citations (14)