An analysis of the Amazon basin hydrologic cycle has been carried out using the NASA/GEOS1 atmospheric reanalysis, observed rainfall of Xie and Arkin, and historical Amazon river discharge. Over a seasonal cycle, the precipitation is found to vary by 5 mm day 1, the runo by 2 mm day 1 while the evaporation largely remains constant. On interannual time scales, the hydrologic variability both in ...

Introduction: Studying the changes in surface water storage and exchanges with groundwater in the hydrological system of rivers is a prerequisite for water resources management in the basin. In this paper, Zayandehrood River has been studied and the historical series of flow has been used in six hydrographic stations located downstream the Zayandehrood Dam. Materials and Methods: Based on the ...

flood spreading has an effective role in the soil improvement and fertility, ground water storage, revival of vegetation and prevention of fluent sands movement. one of the main problem of flood spreading projects is the entrance of sediment to the spreading systems and sedimentation in it. sediment reduces the efficiency of the flood spreading system and after awhile lose its efficiency.the ma...

• Soil hydrologic parameters including field saturation, field capacity, initiation of plant water stress and plant extraction limits can be reliably determined from electronic soil moisture sensor records. • Soil profile wetting and drying occurs along a regular continuum of soil moisture following the advance of the wetting from to the effective base of the soil profile. • Frozen soil conditi...

rameterized for a given porous medium by slope and intercept values obtained through field calibration (HigThe neutron thermalization method for soil water content measurenett and Evett, 2002). For probe designs common in the ment is well established as being accurate for deep soil profile measurements. However, the method has been criticized as inaccurate for 1960s, about 95% of the measured s...

We replace the existing land surface parameterization scheme, the Biosphere-Atmosphere Transfer Scheme (BATS), in a regional climate model (RegCM) with the newly developed Common Land Model (CLM0). The main improvements of CLM0 include a detailed 10-layer soil model, the distinction between soil ice and water phases, a linked photosynthesis-stomatal conductance model, a multilayer snow model, a...

for model calibration. Thus, less effort has been expended in developing comprehensive statistical methVolumetric soil-water depth profiles at nine sample locations on ods to characterize the spatial variability of hydrological a 2-ha hillslope were monitored throughout the 1997-1998 El Niño and the 1998-1999 La Niña cycles. A hydrological model integrating and ecological processes, especially ...