Temporal Water Balance of Precipitation Behavior in the Sand Dunes of Hares-Abad Area, Sabzevar, Iran

With announcing of the condition of water balance in sand dunes, it is easily possible biological reclamation and sustainable management of arid lands. to this end, a survey with eight vertical profiles was conducted in the sand dunes near haresabad, sabzevar, iran, taking into account the effective factors in water balance in the soil moisture control section. considering the morphology of sand dunes, the measurements were concentrated on two kinds of sand dunes including affixed sand dune and an active one, where the samples were distributed well on the different slopes of the active dune (three samples each from both the windward slope and the leeward slope, and one sample from the crest of the dune, and a sample as control from the fixed sand dune). monthly moisture variations in the soil moisture control section were measured by tdr (timedomain reflectometry sensors) over two water years from 2014 to 2016. besides, evapotranspiration rate was also calculated by the equation of water balance based on temperature and precipitation data. the findings show that the sand dunes in the study area are classified as noninfiltrative; that is to say that excess water does not reach aquifer.