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[edit] LOADEST
Contents |
[edit] Metadata
| Modeler information | |
|---|---|
| First name | Rob |
| Last name | Runkel |
| Type of contact | Technical contact |
| Institute / Organization | U.S. Geological Survey |
| Postal address 1 | Denver Federal Center |
| Postal address 2 | |
| Town / City | Lakewood |
| Postal code | 80225 |
| State | Colorado |
| Country | USA |
| Email address | runkel@usgs.gov |
| Phone | 303/236-4882 ext. 285 |
| Fax | 303/236-4912 |
| Model identity | |
|---|---|
| Model type | Single |
| Spatial dimensions | |
| Spatial extent | |
| Model domain | , |
| One-line model description | Software for estimating constituent loads in streams and rivers |
| Extended model description | LOAD ESTimator (LOADEST) is a FORTRAN program for estimating constituent loads in streams and rivers. Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). Explanatory variables within the regression model include various functions of streamflow, decimal time, and additional user-specified data variables. The formulated regression model then is used to estimate loads over a user-specified time interval (estimation). Mean load estimates, standard errors, and 95 percent confidence intervals are developed on a monthly and(or) seasonal basis.
The calibration and estimation procedures within LOADEST are based on three statistical estimation methods. The first two methods, Adjusted Maximum Likelihood Estimation (AMLE) and Maximum Likelihood Estimation (MLE), are appropriate when the calibration model errors (residuals) are normally distributed. Of the two, AMLE is the method of choice when the calibration data set (time series of streamflow, additional data variables, and concentration) contains censored data. The third method, Least Absolute Deviation (LAD), is an alternative to maximum likelihood estimation when the residuals are not normally distributed. LOADEST output includes diagnostic tests and warnings to assist the user in determining the appropriate estimation method and in interpreting the estimated loads. The LOADEST software and related materials (data and documentation) are made available by the U.S. Geological Survey (USGS) to be used in the public interest and the advancement of science. You may, without any fee or cost, use, copy, modify, or distribute this software, and any derivative works thereof, and its supporting documentation, subject to the USGS software User's Rights Notice. |
| Model technical information | |
|---|---|
| Supported platforms | Unix, Linux, Windows |
| Other platform | |
| Programming language | Fortran77 |
| Other program language | |
| Code optimized | Single Processor |
| Start year development | 2001 |
| Does model development still take place? | No |
| If above answer is no, provide end year model development | 2005 |
| Model availability | As code, As teaching tool, As executable |
| Source code availability (Or provide future intension) | Through owner |
| Source web address | |
| Program license type | Other |
| Program license type other | U.S. Government software product |
| OpenMI compliant | No but possible |
| CCA component | No but possible |
| IRF interface | No but possible |
| Memory requirements | -- |
| Typical run time | -- |
| Input - Output description | |
|---|---|
| Describe input parameters | Given a time series of streamflow, additional data variables, and constituent concentration, LOADEST assists the user in developing a regression model for the estimation of constituent load (calibration). |
| Input format | ASCII |
| Other input format | |
| Describe output parameters | Estimated constituent loads |
| Output format | ASCII |
| Other output format | |
| Pre-processing software needed? | No |
| Describe pre-processing software | |
| Post-processing software needed? | No |
| Describe post-processing software | See, http://water.usgs.gov/software/loadest/faq/ |
| Visualization software needed? | No |
| If above answer is yes | |
| Other visualization software | |
| Process description model | |
|---|---|
| Describe processes represented by the model | -- |
| Describe key physical parameters and equations | -- |
| Describe length scale and resolution constraints | -- |
| Describe time scale and resolution constraints | -- |
| Describe any numerical limitations and issues | -- |
| Model testing | |
|---|---|
| Describe available calibration data sets | -- |
| Upload calibration data sets if available: | |
| Describe available test data sets | See applications described in software documentation http://water.usgs.gov/software/loadest/doc/ |
| Upload test data sets if available: | |
| Describe ideal data for testing | -- |
| Users groups model | |
|---|---|
| Do you have current or future plans for collaborating with other researchers? | -- |
| Documentation model | |
|---|---|
| Provide key papers on model if any | http://water.usgs.gov/software/loadest/apps/ |
| Is there a manual available? | Yes |
| Upload manual if available: | Media:Loadest.pdf |
| Model website if any | http://water.usgs.gov/software/loadest/ |
| Model forum / discussion board | |
| Additional comments | |
|---|---|
| Comments | http://water.usgs.gov/software/loadest/ |
