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Wang Suping - One of the best experts on this subject based on the ideXlab platform.

Carmela Chao De Báez - One of the best experts on this subject based on the ideXlab platform.

Mohammad Valipour - One of the best experts on this subject based on the ideXlab platform.

  • analysis of Potential Evapotranspiration using limited weather data
    Applied Water Science, 2017
    Co-Authors: Mohammad Valipour
    Abstract:

    The most important weather variations are temperature (T), relative humidity (RH), and wind speed (u) for Evapotranspiration models in limited data conditions. This study aims to compare three T-based formula, T/RH-based formula, and T/RH/u-based formula to detect the performance of them under limited data and different weather conditions. For this purpose, weather data were gathered from 181 synoptic stations in 31 provinces of Iran. The Potential Evapotranspiration was compared with the FAO Penman–Monteith method. The results showed that T-based formula, T/RH-based formula, and T/RH/u-based formula estimated Potential Evapotranspiration with R 2 >0.93 for 6, 12, and 30 provinces of Iran, respectively. They are more suitable for southeast of Iran (YA, KE, SB, and SK). The best precise method was the T/RH/u-based formula for SK and GO. Finally, a list of the best performance of each method has been presented to use other regions and next researches according to values of temperature, relative humidity, and wind speed. The best weather conditions to use the formulas are 14–26 °C and 2.50–3.50 m/s for temperature and wind speed, respectively.

  • evaluation of radiation methods to study Potential Evapotranspiration of 31 provinces
    Meteorology and Atmospheric Physics, 2015
    Co-Authors: Mohammad Valipour
    Abstract:

    The present study aims to calibrate radiation-based methods to determine the best method under different weather conditions. For this purpose, weather data was collected from different synoptic stations in all of provinces of Iran. The Potential Evapotranspiration was estimated using common radiation-based methods and a sensitive analysis was done for investigating variations of the methods. The results show that the Stephens method estimates the Potential Evapotranspiration better than other methods in the most provinces of Iran (10 provinces). However, the values of R 2 were less than 0.98 for 15 provinces of Iran. The calibrated methods estimated the Potential Evapotranspiration in the south east of Iran better than other provinces. Precision of the methods calibrated has been increased in all provinces. The R 2 values are less than 0.98 for only six provinces (WA, EA, GO, NK, AL, and QO). In the methods calibrated, the Abtew (for YA) estimated the Potential Evapotranspiration better than the other methods.

  • retracted comparative evaluation of radiation based methods for estimation of Potential Evapotranspiration
    Journal of Hydrologic Engineering, 2015
    Co-Authors: Mohammad Valipour
    Abstract:

    AbstractEvapotranspiration has a major role in agricultural and forest meteorology researches, hydrological cycle, irrigation scheduling, and water resources management. There are many methods to estimate the Potential Evapotranspiration including mass transfer, radiation, temperature, and pan evaporation-based methods. The present study aims to compare radiation-based methods to determine the best method under different weather conditions. The results discussed in this paper are from the data collected in the study area, but the method can be used in other similar regions. For this purpose, weather data was collected from 181 synoptic stations in 31 provinces of Iran. The Potential Evapotranspiration was estimated using 22 radiation-based methods and compared with the Food and Agriculture Organization of the United Nations (FAO) Penman-Monteith method. The results show that the Stephens method estimates the Potential Evapotranspiration better than other methods for provinces of Iran. However, the values ...

Megh R. Goyal - One of the best experts on this subject based on the ideXlab platform.

Wang Jian-bin - One of the best experts on this subject based on the ideXlab platform.

  • The Variety Characters of Potential Evapotranspiration and Soil Surface Humidity Index in the Zoige Wetland in1971-2010
    2020
    Co-Authors: Wang Jian-bin
    Abstract:

    The meteorological data of the Zoige, Hongyuan and Maqu weather observation stations were used,the Potential Evapotranspiration was computed by using Penman-Monteith model. The results indicated that the Potential Evapotranspiration variation in the Zoige wetland shows an obvious increasing tendency with the tendency ratio of 9.1 mm/10 a,An abrupt change of the Potential Evapotranspiration was detected in the 2001,the mean Potential Evapotranspiration during 2001-2010 has increased by 28.6 mm compared with that of1971-2000. The autumn Potential Evapotranspiration increased with the tendency ratio of 4.3mm/10 a,its more higher than the other seasons. The annual Potential Evapotranspiration's minimum period is 1980 s, it obviously increased from 1990 s, the variety of seasonal Potential Evapotranspiration in spring, summer and autumn is very similar to that of annual. The winter Potential Evapotranspiration minimum period is 1990 s, it obviously increased in the 21 st.The cycle change is 7-8 a during 1970 s and 1980 s, from the end of 1980 s to the end of1990 s, it is an obviously adjusted period, the cycle change is 5a from the beginning of 21 st. The temperature rising, relative humidity and precipitation decreasing are the major contributors to the Potential Evapotranspiration increased. Although the decreasing of the sunshine duration and mean wind velocity is help to the Potential Evapotranspiration decreased, but the temperature rising plays a more important role to the Potential Evapotranspiration increased. The decreasing tendency of soil surface humidity index is-0.03/10 a,the soil surface humidity index has decreased 0.11 during 2001-2010 compared with that of 1981-1990. meanwhile, the increasing tendency of the mean temperature is 0.41℃/10 a, the decreasing tendency of the precipitation is-13.5mm/10 a, the climate change of the Zoige wetland shows an obviously warm-drying tendency.