Model help:HydroTrend: Difference between revisions
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!Parameter!!Description!!Unit | !Parameter!!Description!!Unit | ||
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|width="20%"|Starting mean annual temperature | |width="20%"| Starting mean annual temperature | ||
|width="60%"| | |width="60%"| Mean annual temperature at the river mouth at the start of the simulation. (Notice: ''this is not a spatial average basin width parameter!'') | ||
|width="20%"|[°C] | |width="20%"| [°C] | ||
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|Change in mean annual temperature | |Change in mean annual temperature | ||
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!Parameter!!Description!!Unit | !Parameter!!Description!!Unit | ||
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|width="20%"|Starting mean annual precipitation | |width="20%"| Starting mean annual precipitation | ||
|width="60%"| | |width="60%"| Annual total spatial river basin average precipitation rates for the beginning of the simulation | ||
|width="20%"|[m/year] | |width="20%"| [m/year] | ||
|- | |- | ||
|change in mean annual precipitation | |change in mean annual precipitation | ||
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!Parameter!!Description!!Unit | !Parameter!!Description!!Unit | ||
|- | |- | ||
|width="20%"|Lithology factor | |width="20%"| Lithology factor | ||
|width="60%"| | |width="60%"| | ||
|width="20%"|[-] | |width="20%"| [-] | ||
|- | |- | ||
|Anthropogenic facor | | Anthropogenic facor | ||
| | | | ||
|[-] | | [-] | ||
|- | |- | ||
|Lapse rate | | Lapse rate | ||
| | | The change in temperature per change in elevation. Parameter used to determine the snow - rain transition zone | ||
|[°C/km] | | [°C/km] | ||
|- | |- | ||
|Starting ELA | | Starting ELA | ||
| | | Glacier equilibrium line altitude is the long-term balance point along a glacier. The ELA is where the amount of accumulated snow and ablated water are equal. | ||
|[m] | | [m] | ||
|- | |- | ||
|Change in ELA | | Change in ELA | ||
| | | Is the linear amount of change per year of the equilibrium line altitude due to a shift in the climate | ||
|m/year] | | [m/year] | ||
|- | |- | ||
|Dry precipitation (nival and ice) evaporation fraction | | Dry precipitation (nival and ice) evaporation fraction | ||
| | | | ||
|[-] | | [-] | ||
|- | |- | ||
|River length | | River length | ||
| | | The length of the main stem of the river to determine the lag time before water reaches the river outlet. | ||
|[km] | | [km] | ||
|- | |- | ||
|Mean volume of reservoir | | Mean volume of reservoir | ||
| | | | ||
|[km<sup>3</sup>] | | [km<sup>3</sup>] | ||
|- | |- | ||
|Drainage area of reservoir | |Drainage area of reservoir |
Revision as of 16:33, 31 October 2010
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
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 | = ω B Q0.31 A0.5 R T | for T ≥ 2 °C | = Long-term suspended sediment load at the river mouth [kg/s] | (2a) or |
Qs | = 2ω B Q0.31 A0.5 R | for T < 2 °C | = Long-term suspended sediment load at the river mouth [kg/s] | (2b) |
B | = L (1 - TE) Eh | = importance of geology and human factors | (3) | |
(Qs[i] / Qs) | = ψ[i] (Q[i] / Q)Ca | = Daily suspended sediment load at the river mouth [kg/s] | (4) | |
Qb[i] | = (ρs / ρs - ρ) * (ρ g Q[i]β S eb) / (g tan λ) | when u ≥ ucr | = Daily bedload at the river mouth [kg/s] | (5) |
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] |
ω | Constant, (0.02) | [-] |
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 | [-] |
Qs[i] | Daily suspended sediment load | [kg/s] |
Ψ[i] | Daily random variable with a log-normal distribution | [-] |
Q[i] | Daily water discharge | [m3/s] |
Ca | Annual rating term coefficient with a normal distrbution | [-] |
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 | [-] |
u | Stream velocity | [m/s] |
ucr | Critical stream velocity | [m/s] |
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)
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.