2.1. Hydrologic Water Balance Models

2.1.1. CREST

The Coupled Routing and Excess Storage (CREST) distributed hydrological model is a hybrid strategy developed by the University of Oklahoma and the NASA SERVIR Project Team. CREST simulates the spatiotemporal variation of water and energy fluxes and storages on a user-defined grid. Its scalability is achieved through sub-grid scale representation of soil moisture storage (using a variable infiltration curve) and runoff generation (using linear reservoirs). Originally developed for global flood predictions, it is also suitable for basin-scale applications.

More detailed information about CREST can be found in the publication: Flamig et al., (2020)

2.1.1.1. CREST Parameter Set block

Defines the parameters for the CREST model.

[CrestParamSet ABRFC]
wm_grid=/path/to/wm.tif
im_grid=/path/to/im.tif
fc_grid=/path/to/ksat.tif
b_grid=/path/to/b.tif
gauge=03455500
wm=1.00
b=1.0
im=0.01
ke=1.0
fc=1.00
iwu=50.0

2.1.2. SAC-SMA

The Sacramento Soil Moisture Accounting (SAC-SMA) Model was developed by the U.S. National Weather Service. Its purpose is to parameterize soil moisture characteristics so that applied moisture is logically distributed, percolation is realistically simulated, and streamflow is effectively modeled.

More detailed information about SAC-SMA is available at: U.S. NWS SAC-SMA algorithm description

2.1.2.1. SAC-SMA Parameter Set

Defines the parameters for the SAC-SMA model.

[SacParamSet ABRFC]
UZTWM_grid=/path/to/uztwm.tif
UZFWM_grid=/path/to/uzfwm.tif
UZK_grid=/path/to/uzk.tif
ZPERC_grid=/path/to/zperc.tif
REXP_grid=/path/to/rexp.tif
LZTWM_grid=/path/to/lztwm.tif
LZFSM_grid=/path/to/lzfsm.tif
LZFPM_grid=/path/to/lzfpm.tif
LZSK_grid=/path/to/lzsk.tif
LZPK_grid=/path/to/lzpk.tif
PFREE_grid=/path/to/pfree.tif
gauge=01055000
UZTWM=1.0
UZFWM=1.0
UZK=1.0
PCTIM=0.101
ADIMP=0.10
RIVA=1.001
ZPERC=1.0
REXP=1.0
LZTWM=1.0
LZFSM=1.0
LZFPM=1.0
LZSK=1.0
LZPK=1.0
PFREE=1.0
SIDE=0.0
RSERV=0.3
ADIMC=1.0
UZTWC=0.55
UZFWC=0.14
LZTWC=0.56
LZFSC=0.11
LZFPC=0.46

2.1.3. HP

The Hydrophobic (HP) water balance model assumes an entirely impervious surface where all rainfall is transformed directly into surface runoff.

Warning

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