Temporal-spatial scale effect on actual evapotranspiration in a semi-arid basin

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外文摘要：This paper developed an approach of the accuracy assessment in multi temporal-spatial scales。 The SEBAL model and Thornthwaite water balance model were employed to calculate the daily ETa on three spatial scales。 Then， three time scales ETa were expanded。 Of them， the units were delineated by hydrological response unit (HRU)。 The calculating results of two models were compared on different scales。 The results were that with the increase of temporal scale， the slopes of regression curves between unit results from two methods were 0。555， 0。667 and 0。813， with related coefficients of 0。714， 0。809 and 0。762。 The ET difference decreased with the increase of spatial scale。 On a monthly scale， the average of relative errors was over 30% at point scale， 10。3% and 1。59% at unit and basin scale， with RMSE of 8。32%， 9。51% and 0。43%。 The better accuracy could be achieved at the larger scales because of the uncertainty decreasing。 Experimental results indicated that temporal uncertainty is a key issue which needs further study， and the remote sensing method at the unit scale is beneficial to the water resources assessment and ET management in a changing regional environment。

外文关键词：

evapotranspirationtemporal scalespatial scaleSEBAL modelthornthwaite water balance modelheterogeneityuncertainty

作者：

FANG YINGYING、ZHANG YOUJING、WANG WENZHONG

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作者单位：

Department of Earth Sciences and Engineering, Hohai University, Naijing 210098, China

Department of Earth Sciences and Engineering, Hohai University, Naijing 210098, China,State Key Laboratory of Hydrology-Water Resource and Hydraulic Engineering, Hohai University, Naijing 210098, China

State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China

会议名称：

IWRM2010;International symposium on integrated water resources management;International symposium on methodology in hydrology

会议地点：

Nanjing(CN);Nanjing(CN);Nanjing(CN)

会议母体文献：

Hydrological cycle and water resources sustainability in changing environments

页码：

p.67-73

出版时间：

2010