Assessing distributed mountain-block recharge in semiarid environments. Huade Guan and John L. Wilson GSA Annual Meeting Nov. 10, 2004. Precipitation. Soil. Soil water. Surface Fault Trace. FS. Bedrock. Distributed MBR depends on across the soil-bedrock interface. DS. FR.
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Huade Guan and John L. Wilson
GSA Annual Meeting
Nov. 10, 2004
Surface Fault Trace
Distributed MBR depends on
across the soil-bedrock interface
OBLIQUEFAULTWhat is distributed MBR?
Recharge that occurs on hill slopes in the mountain block
Total MBR = distributed MBR + focused MBR
Focused MBR occurs near and in stream channels and rivulets
= Infiltration – Evapotranspiration (ET)
(HYDRUS steady-state simulations, ET was not modeled)
Two primary controls for percolation
The results have shown that major controls are net infiltration & bedrock permeabilityslope, soil and bedrock topography are not important.
Slope = 0.3 Depression index = 0.1 Soil = sandy loam
Soil and bedrock effects
Percolation: in % of Precip
More controls for percolation
Slope aspects, vegetation cover, soil thickness for given bedrocks (transient, HYDRUS)
Study areas environments
Basin oriented water balances suggest:
and total MBR ~ 70mm/yr =14% P in Sangre de Cristo (granite and well-cemented sedimentary rock)
Are these total MBR estimates reasonable?
Where PET is annul potential ET
P is annual precipitation
Some approximations environmentsfor a hillslope in the mountains:
Percolation=f(PET/P) HYDRUS sim.
Slope =0.1 (not to scale)
0.1 slope environments
Percolation=f(PET/P) environmentsHYDRUS sim.
Percolation = f1(PET/P)
Percolation = f2(PET/P)
Spatial trend environments
Slope aspect and prevailing wind
Precipitation mapping: ASOADeK
and de-trended kriging
Sum of 12 monthly precipitation
PET mapping: environmentsHargreaves 1985 + SEP4HillET
Ra: daily extraterrestrial solar radiation in equivalent depth of water
Rais dependent of the slope steepness and aspect, solved using SEP4HillET model
Ratio of Raon sloped surface to
that on flat surface (from SEP4HillET)
N S N
N S N
Temperature mapping environments
Topographic corrected geostatistical interpolations of temperature
Daily maximum temperature
Daily minimum temperature
M1,2,3, 10, 11, 12
Maps of PET environments
Sangre de Cristo Mountains
Maps of potential distributed MBR environmentsat hypothetical northern NM mountains
Sangre de Cristo Mountains
Min: 0 Max: 193
Mean: 47 Median: 42
Min: 0 Max: 113
Mean: 16 Median: 0.44
Mtns. Previous studies This study
(Total MBR)(Max. rate of distributed MBR)
Sangre’s 50-100 mm/yr 16 mm/yr
Jemez/ 47 mm/yr
San Juan 200 mm/yr
Distributed MBR << Total MBR
Focused MBR, in stream channels and rivulets appears to be the most important component of MBR for these two mountain regions and both rock types.
This is still a work in progress, and didn't use all spatial information on soil and vegetative cover, etc.