scholarly journals USING CHLORIDE TO TRACE WATER MOVEMENT IN THE UNSATURATED ZONE AT YUCCA MOUNTAIN

1998 ◽  
Author(s):  
J. Fabryka-Martin ◽  
L. Flint ◽  
A. Wolfsberg ◽  
D. Sweetking ◽  
D. Hudson ◽  
...  
Keyword(s):  
Unsaturated Zone ◽  
Water Movement ◽  
Yucca Mountain ◽  
Trace Water

Unsaturated zone tritium and chlorine 36 profiles from southern Australia: Their use as tracers of soil water movement

1994 ◽  
Vol 30 (6) ◽  
pp. 1709-1719 ◽  
Author(s):  
P. G. Cook ◽  
I. D. Jolly ◽  
F. W. Leaney ◽  
G. R. Walker ◽  
G. L. Allan ◽  
...  
Keyword(s):  
Soil Water ◽  
Unsaturated Zone ◽  
Water Movement ◽  
Chlorine 36 ◽  
Soil Water Movement

scholarly journals Towards a simple representation of chalk hydrology in land surface modelling

2017 ◽  
Vol 21 (1) ◽  
pp. 459-471 ◽  
Author(s):  
Mostaquimur Rahman ◽  
Rafael Rosolem
Keyword(s):  
Land Surface ◽  
Unsaturated Zone ◽  
Large Scale ◽  
Management Practices ◽  
Preferential Flow ◽  
Water Movement ◽  
Model Parameters ◽  
Catchment Scale ◽  
Surface Modelling ◽  
Land Surface Modelling

Abstract. Modelling and monitoring of hydrological processes in the unsaturated zone of chalk, a porous medium with fractures, is important to optimize water resource assessment and management practices in the United Kingdom (UK). However, incorporating the processes governing water movement through a chalk unsaturated zone in a numerical model is complicated mainly due to the fractured nature of chalk that creates high-velocity preferential flow paths in the subsurface. In general, flow through a chalk unsaturated zone is simulated using the dual-porosity concept, which often involves calibration of a relatively large number of model parameters, potentially undermining applications to large regions. In this study, a simplified parameterization, namely the Bulk Conductivity (BC) model, is proposed for simulating hydrology in a chalk unsaturated zone. This new parameterization introduces only two additional parameters (namely the macroporosity factor and the soil wetness threshold parameter for fracture flow activation) and uses the saturated hydraulic conductivity from the chalk matrix. The BC model is implemented in the Joint UK Land Environment Simulator (JULES) and applied to a study area encompassing the Kennet catchment in the southern UK. This parameterization is further calibrated at the point scale using soil moisture profile observations. The performance of the calibrated BC model in JULES is assessed and compared against the performance of both the default JULES parameterization and the uncalibrated version of the BC model implemented in JULES. Finally, the model performance at the catchment scale is evaluated against independent data sets (e.g. runoff and latent heat flux). The results demonstrate that the inclusion of the BC model in JULES improves simulated land surface mass and energy fluxes over the chalk-dominated Kennet catchment. Therefore, the simple approach described in this study may be used to incorporate the flow processes through a chalk unsaturated zone in large-scale land surface modelling applications.

Uncertainty Analyses of Unsaturated Zone Travel Time at Yucca Mountain

Ground Water ◽  
1993 ◽  
Vol 31 (2) ◽  
pp. 293-301 ◽  
Author(s):  
William E. Nichols ◽  
Mark D. Freshley
Keyword(s):  
Travel Time ◽  
Unsaturated Zone ◽  
Yucca Mountain ◽  
Uncertainty Analyses
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