نتایج جستجو برای: water balance model

تعداد نتایج: 2680646  

2007
K. Schwärzel

For a sustainable forest management, a sitespecific knowledge on the water balance is a prerequisite. A simple and popular field method for assessing the water balance of forest sites is based on overlaying relief and soil information. Furthermore, climatic influence on the water balance is often restricted to longtime average values of precipitation and air temperature (whole year and/or growi...

2008
Hilmar Hofmann Kay Knöller Dieter Lessmann

In the present study, the stable isotopes υ18O and υ2H were used for assessment of the water balance in a heterogeneously structured catchment area in the Lusatian Lignite Mining District, in particular, for estimation of the annual groundwater inflow and outflow (IGW and OGW) of Mining Lake Plessa 117. The application of stable isotopes was possible since the water exchange in the catchment ar...

Journal: :Nature 1972

2005
C.-Y. Xu D. Chen

This study evaluates seven evapotranspiration models and their performance in water balance studies by using lysimeter measurement data at the Mönchengladbach hydrological and meteorological station in Germany. Of the seven evapotranspiration models evaluated, three models calculate actual evapotranspiration directly using the complementary relationship approach, i.e. the CRAE model of Morton, ...

Journal: :مدیریت آب و آبیاری 0
جعفر نیکبخت دانشیار گروه مهندسی آب، دانشکدۀ کشاورزی، دانشگاه زنجان، زنجان، ایران زهرا نجیب کارشناس ارشد آبیاری و زهکشی، دانشکدۀ کشاورزی دانشگاه زنجان، زنجان، ایران

excessive withdrawal of groundwater and reduced rainfall in recent years have caused the drawdown of groundwater table. therefore, it is necessary to manage it for preventing its damage. the present study was carried out to investigate the effect of increasing the irrigation efficiency on groundwater fluctuation on ajab-shir plain aquifer. the aquifer was simulated by using visual modflow 3.1 s...

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