The accuracy with which MODFLOW simulates surface water-groundwater interaction is examined for connected and disconnected losing streams. We compare the effect of different vertical and horizontal discretization within MODFLOW and also compare MODFLOW simulations with those produced by HydroGeoSphere. HydroGeoSphere is able to simulate both saturated and unsaturated flow, as well as surface wa...

This paper presents an overview of some of the research performed at the Bureau of Reclamation, Mid-Pacific GIS Service Center over the past two years related to the application of ArcObjects technology involving hydrodynamic modeling. Topics include finite element mesh generation and the representation of mesh components as a geometric network, construction of 3D fence diagrams in applications...

Benchmarking coupled surface-subsurface flow models becomes more important as they are increasingly used for operational purposes (e.g. in water management) and long-term analysis (e.g. in climate change research). For this reason we inter-compare the hydrogeological models HydroGeoSphere and OpenGeoSys and present results with emphasis on the parametrization of the surface-soil water coupling ...

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. ...

We investigated the potential impact of observation error on calibration performance an integrated watershed model. A three-dimensional model was constructed using HydroGeoSphere and applied to Sabgyo in South Korea assess groundwater–surface water interaction process. During calibration, three different weighting schemes that consider variances were parameter estimation tool (PEST). The compar...

We present a set of new, semi-analytical solutions to simulate three-dimensional contaminant transport subject to first-order chain-decay reactions. The aquifer is assumed to be areally semi-infinite, but finite in thickness. The analytical solution can treat the transformation of contaminants into daughter products, leading to decay chains consisting of multiple contaminant species and various...

Parameterization of physically based and distributed hydrological models for mesoscale catchments remains challenging because the commonly available data base is insufficient for calibration. In this paper, we parameterize a mesoscale catchment for the distributed model HydroGeoSphere by transferring evapotranspiration parameters calibrated at a highly-equipped headwater catchment in addition t...