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| Daily evapotranspiration estimation of Panjin wetland based on SEBAL model and its distribution characteristics |
| YU Wenying1, JI Ruipeng1, XU Dezeng2, JIA Qingyu1, FENG Rui1, SUN Longyu3, WU Jinwen1, ZHANG Yushu1 |
1. Institute of Atmospheric Environment, China Meteorological Administration, 110166, Shenyang, China;
2. Liaoning Water Conservancy and Hydropower Survey and Design Research Institute, 110006, Shenyang, China;
3. Meteorological Bureau of Shenyang, 110168, Shenyang, China |
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Abstract [Background] The Liaohe Delta wetland is rich in water resources, but in recent decades, "warm dry" trend is obvious in wetland due to the climate change and human activities. Wetland evapotranspiration is the main way of water loss in wetland ecosystem, and the study of wetland evapotranspiration may enhance the understanding of wetland water balance, and provide a basis for the protection of wetland ecological function and water resources management.[Methods] In order to test the accuracy of SEBAL model for simulating the wetland evapotranspiration, the instantaneous evapotranspiration of Panjin wetland at satellite transit time in typical sunny day from 2013 to 2015 was estimated using Landsat 8 data and SEBAL model, and was corrected by the observed data of eddy covariance system. By using the sine function method, the corrected instantaneous evapotranspiration was converted to daily evapotranspiration, and then the distribution characteristic of daily evapotranspiration for reed and rice wetland was analyzed.[Results]The result showed that the instantaneous evapotranspiration of Panjin wetland estimated by SEBAL model was higher than the measured value of eddy covariance system, and the average relative error was 31.6%. However, the correlation between the estimated value and the measured value was significant, with a correlation coefficient 0.79, thus it was feasible to estimate the wetland evapotranspiration by using SEBAL model. In order to improve the precision, the linear equation was established and the estimated values were corrected; the relative error was 6.4% between the corrected value and measured value, and the precision increased by 25.2%. Daily evapotranspiration of reed and rice wetland were in the range of 2.5-5.0 mm/d, with the average daily evapotranspiration of reed wetland and rice wetland were 3.55-3.83 mm/d and 3.66-4.01 mm/d, respectively. In spatial distribution, there was no significant difference in the terrain, and the daily evapotranspiration was uniform; the daily evapotranspiration of reed wetland was concentrated in 3.4-4.0 mm/d which accounted for 64.7%-82.4% of total area; the daily evapotranspiration of rice wetland was concentrated in 3.6-4.1 mm/d which accounted for 67.4%-86.6% of total area; the daily evapotranspiration of rice wetland was 0.1-0.2 mm/d higher than that of reed wetland in most area of Panjin wetland. The spatial distribution of evapotranspiration is mainly affected by the underlying surface, the terrain is flat in Panjin, and the distribution of wetland vegetation is uniform.[Conclusions] The application of SEBAL model for wetland evapotranspiration provided an accurate assessment method of regional evapotranspiration in wetland, but due to the large number of parameters in the SEBAL model, the error increased, thus the parameters in SEBAL model needed to be improved. In addition, the remote sensing data may only be applied in the sunny day, and it was difficult to determine the evapotranspiration in cloudy day, which needs a further research.
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Received: 17 March 2017
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