Model:LOADEST: Difference between revisions
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|ModelDomain=Terrestrial, Hydrology, Coastal | |||
|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. | |||
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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 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. | 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. | ||
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{{Model keywords | |||
|Model keywords=biogeochemistry | |||
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|Model keywords=water quality | |||
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{{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 | |||
|Town / City=Lakewood | |||
|Postal code=80225 | |||
|Country=United States | |||
|State=Colorado | |||
|Email address=runkel@usgs.gov | |||
|Phone=303/236-4882 ext. 285 | |||
|Fax=303/236-4912 | |||
}} | |||
{{Model technical information | |||
|Supported platforms=Unix, Linux, Windows | |||
|Programming language=Fortran77 | |||
|Code optimized=Single Processor | |||
|Start year development=2001 | |||
|Does model development still take place?=No | |||
|End year development=2005 | |||
|DevelopmentCode=Only maintenance | |||
|DevelopmentCodeYearChecked=2020 | |||
|Model availability=As code | |||
|Source code availability=Through web repository | |||
|Source web address=http://water.usgs.gov/software/loadest/ | |||
|Program license type=Other | |||
|Program license type other=U.S. Government software product | |||
|Memory requirements=-- | |||
|Typical run time=-- | |||
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{{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 | |||
|Describe output parameters=Estimated constituent loads | |||
|Output format=ASCII | |||
|Pre-processing software needed?=No | |||
|Post-processing software needed?=No | |||
|Visualization software needed?=No | |||
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{{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=-- | |||
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{{Model testing | |||
|Describe available test data sets=See applications described in software documentation http://water.usgs.gov/software/loadest/doc/ | |||
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{{Users groups model | |||
|Do you have current or future plans for collaborating with other researchers?=-- | |||
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{{Documentation model | |||
|Manual model available=Yes | |||
|Model manual=Loadest.pdf | |||
|Model website if any=http://water.usgs.gov/software/loadest/ | |||
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{{Additional comments model | |||
|Comments=http://water.usgs.gov/software/loadest/ | |||
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|OpenMI compliant=No but possible | |||
|IRF interface=No but possible | |||
|CMT component=No but possible | |||
|CCA component=No but possible | |||
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== | ==Introduction== | ||
== | == History == | ||
== | == References == | ||
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== | == Issues == | ||
== | == Help == | ||
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== Input Files == | |||
== Output Files == |
Latest revision as of 20:20, 16 September 2020
LOADEST
Metadata
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Introduction
History
References
Nr. of publications: | 31 |
Total citations: | 1387 |
h-index: | 13 |
m-quotient: | 0.65 |
Featured publication(s) | Year | Model described | Type of Reference | Citations |
---|---|---|---|---|
Runkel, R.L.; Crawford, C.G.; Cohn, T.A.; 2004. LOAD ESTIMATOR (LOADEST): A FORTRAN PROGRAM FOR ESTIMATING CONSTITUENT LOADS IN STREAMS AND RIVERS. In: (eds.)Techniques and Methods Book 4, Chapter A5.. . (View/edit entry) | 2004 | LOADEST |
Model overview | 732 |
See more publications of LOADEST |