This paper presents the simulation results obtained from a physically based surface-subsurface hydrological model in 5730 km2 watershed and runoff response of models for three methods used to generate spatial precipitation distribution: Thiessen polygons (TP), Co-Kriging (CK) interpolation simulated annealing (SA). The HydroGeoSphere is employed simulate rainfall-runoff process two watersheds. ...

Climatic parameters in time and space scales of change are for many reasons of Changes and how they should be based on observations using a statistical method to be determined. Analysis of the most widely used statistical methods that assess potential climate change on hydrological time series, such series of precipitation, temperature and flow rate used. This study of 11 synoptic,rain gage and...

â  abstract â  in this study by data of synoptic stations in karoon basin, the intensive showers with 1,2,6 and 9 hour duration have been extracted and the precipitation time regime has been evaluated by ranking method and non dimensional accumulation curve. in ranking method, first the showers of each time base have been divided to smaller periods and on this basis different periods of showers...

Of these six precipitation methods, I, II, and VI best minimize AA interference. Despite the greater dilution involved with the unbuffered PEG method, the degree of interference is similar to that found with methods III and IV. AA is known to oxidize rapidly in the presence of oxygen, especially at high pH values (6), and this may be the mechanism by which the interference is decreased in the t...

[1] Representing spatially varying precipitation for current grid length scales used in General Circulation Models (GCMs) is a continuing challenge. Furthermore, to fully capture the hydrologic effects of nonuniform precipitation, a representation of soil moisture heterogeneity and distribution of spatially varying precipitation must exist within the same framework. For this study, the explicit...

This paper presents a critical review of a number of popular methods that have been developed to retrieve cloud and precipitation properties from satellite radiance measurements. The emphasis of the paper is on the retrieval uncertainties associated with these methods, as these shape future data assimilation applications, either in the form of direct radiance assimilation or assimilation of ret...