Model Instance Title:
North Oxfordshire Recharge Model  
Model Instance Short Name:
North Oxfordshire Recharge  
A method to improve the calculation of overland flow in distributed groundwater recharge models is presented and applied to two sub-catchments in the Thames Basin, UK. Recharge calculation studies tend to simulate the runoff flow component of river flow in a simplistic way, often as a fraction of rainfall over a particular period. The method outlined in this study intends to improve the calculation of groundwater recharge estimates in distributed recharge models but does not present an alternative to complex overland flow simulators. This method uses seasonally varying coefficients to calculate runoff for specified hydrogeological classes or runoff zones, which are used to model base flow index (BFI) variations across the basin. It employs a transfer function model to represent catchment storage. Monte Carlo simulation was applied to refine the runoff values. Decoupling the runoff zones between the two sub-catchments produces a better match between the simulated and observed values; however, the difference between observed runoff and the simulated output indicates other factors, such as landuse and topographical characteristics that affect the generation of runoff flow need to be taken into account when classifying runoff zones  
Creation/Publication Date:
Hazards Floods   
Contact Details:
Andrew Hughes   British Geological Survey   UK  
Model Code Name:
Time Interval Covered:
from: 01-Jan-1970   to: 31-Dec-2008
Spatial Extent:
Bounding Box (Lat/Long WGS84):
West: -1.784   East: -1.05   South: 51.833   North: 52.234  
Scope of Vertical Extent: Superficial  
Vertical Extent (metres above OD) Maximum: 240   Minimum: 65    
Spatial Reference Systems of Datasets:
Horizontal Reference System: WGS 84
Vertical Datum: mean sea level height
Vertical Units: metre
Grid Resolution:
Spacing XSpacing YSpacing ZCells XCells YCells Z
1000   1000     50   45    

Time step interval: day   Time step value: 1
Additional information (science questions addressed, assumptions etc.):
Science Question   Can runoff be better represented by including catchment storage in the calculation method?  
Input Dataset NameVersionURL LinkParameterValueUnits
Rainfall – daily gridded CEH          
MORECS PE          
Landuse LCM2000          
CEH DEM          
Other input parameters          
Output Dataset NameVersionURL LinkParameterValueUnits
Output Data          
    Long term average rainfall      
    River Flow      
Documents and Published Papers available for this model instance:
Mansour, M.M.; Barkwith, A.; Hughes, A.G..   A simple overland flow calculation method for distributed groundwater recharge models   2011