Model help:HydroTrend

HydroTrend

Climate driven hydrological transport model

Model introduction

HydroTrend is an ANSI-standard C numerical model that creates synthetic river discharge and sediment load time series as a function of climate trends and basin morphology and has been used to study the sediment flux to a basin for basin filling models. As a drainage basin simulator, the model provides time series of daily discharge hydraulics at a river mouth, including the sediment load properties. HydroTrend was designed to provide input to lake or shelf circulation and sedimentation models (Steckler et al., 1996; Syvitski and Alcott, 1995b), and study the impact of land-sea fluxes given climatic change scenarios (Moore, 1992; Syvitski and Andrews, 1994). HydroTrend simulates the major processes that occur in a river basin, including:

• Glacierized areas with advances and retreats depending on the climate scenario,
• Snow accumulation in the winter and melt in the subsequent spring/summer,
• Rainfall over the remaining portions of the basin with canopy evaporation,
• Groundwater recharging and discharging,
• The impact of reservoirs.

Model parameters

Input Files and directories

Run Parameters

Temperature

Precipitation

Basin

River Mouth

Groudwater

Output Values

Parameter	Description	Unit
Input directory		[-]
Site prefix		[-]
Case prefix		[-]

Parameter	Description	Unit
Run duration		[years]

Parameter	Description	Unit
Starting mean annual temperature		[°C]
Change in mean annual temperature		[°C/year]
Standard deviation of mean annual temperature		[°C]

Parameter	Description	Unit
Starting mean annual precipitation		[m/year]
change in mean annual precipitation		[m/year/year]
Standard deviation of mean annual precipitation		[m/year]

Parameter	Description	Unit
Lithology factor		[-]
Anthropogenic facor		[-]
Lapse rate		[°C/km]
Starting ELA		[m]
Change in ELA		m/year]
Dry precipitation (nival and ice) evaporation fraction		[-]
River length		[km]
Mean volume of reservoir		[km3]
Drainage area of reservoir		[km2]

Parameter	Description	Unit
k	River mouth velocity coefficient	[m/s]
m	River mouth velocity exponent	[-]
a	River mouth width coefficient	[m]
b	River mouth width exponent	[-]
Average river mouth velocity		[m/s]
Constant annual base flow		[m3/s]
Trapping efficiency		[-]
Delta gradient		[m/m]

Parameter	Description	Unit
Maximum groundwater storage		[m3]
Minimum groundwater storage		[m3]
Initial groundwater storage		m[3]
Groundwater coefficient		[m3]
Groundwater exponent		[-]
Saturated hydraulic conductivity		[mm/day]

Parameter	Description	Unit
Output directory		[-]
Interval between output files		[-]
Mean Velocity file		[-]
Mean Width file		[-]
Mean Depth file		[-]
Mean Water Discharge file		[-]
Mean Sediment Discharge file		[-]
Mean Bedload Flux file		[-]

Uses ports

This will be something that the CSDMS facility will add

Provides ports

This will be something that the CSDMS facility will add

Main equations

Q	= Qr + Qn + Qice - QEv ± Qg	= Water discharge at the river mouth [m3/s]	(1)
Qs	= B Q-0.31 A0.5 R T for T ≥ 2 °C	= Long-term suspended sediment load at the river mouth [kg/s]	(2a) or
Qs	= B Q-0.31 A0.5 R for T < 2 °C	= Long-term suspended sediment load at the river mouth [kg/s]	(2b)
B	= L (1 - TE) Eh		(3)
Qb[i]	= (ρs / ρs - ρ) * (ρ g Q[i]β S eb) / (g tan λ)	= Daily bedload [kg/s]	(4)

Nomenclature

Symbol	Description	Unit
Q	Long-term water discharge	[m3/s]
Qr	Water discharge generated by rainfall	[m3/s]
Qn	Water discharge generated by nival melt	[m3/s]
Qice	Water discharge generated by glacier melt	[m3/s]
QEv	Water discharge loss by evapo-transpiration processes	[m3/s]
Qg	Water discharge loss or generated by ground water	[m3/s]
Qs	Long-term suspended sediment load (30yrs or longer)	[kg/s]
A	Drainage basin area	[km2]
R	Drainage basin relief	[km]
T	Drainage basin temporal and spatial mean temperature	[°C]
L	Lithology factor	[-]
TE	Trapping efficiency of reservoirs / lakes	[-]
Eh	Anthropogenic factor	[-]
Qb[i]	Daily bedload	[kg/s]
ρs	Sand density	[kg/m3]
ρ	Fluid density	[kg/m3]
g	Acceleration due to gravity	[m/s2]
β	Bedload rating term	[-]
S	Slope of the riverbed	[m/m]
eb	Bedload efficiency	[-]
λ	Limiting angle of response of sediment grains lying on the river bed	[-]

Notes

Any notes, comments, you want to share with the user

Numerical scheme

Examples

An example run with input parameters, BLD files, as well as a figure / movie of the output

Follow the next steps to include images / movies of simulations:

• Upload file: http://csdms.colorado.edu/wiki/Special:Upload
• Create link to the file on your page: [[Image:<file name>]].

See also: Help:Images or Help:Movies

Developer(s)

Albert Kettner

References

• Kettner, A.J., and Syvitski, J.P.M., 2008. HydroTrend version 3.0: a Climate-Driven Hydrological Transport Model that Simulates Discharge and Sediment Load leaving a River System. Computers & Geosciences, 34(10), 1170-1183, doi:10.1016/j.cageo.2008.02.008.
• Syvitski, J.P.M., Morehead, M.D. and Nicholson, M., 1998. HYDROTREND: A Climate-driven Hydrologic-Transport Model for Predicting Discharge and Sediment Loads to Lakes or Oceans. Computers & Geosciences, 24(1), 51-68, doi:10.1016/S0098-3004(97)00083-6.
• Syvitski, J.P.M., and J.M. Alcott, 1995. RIVER3: Simulation of River Discharge and Sediment Transport. Computers and Geosciences, 21(1), 89-101, doi:10.1016/0098-3004(94)00062-Y.

Links

Model:HydroTrend