method1: Load estimation with time-weighted flow and concentration...

In RiverLoad: Load Estimation of River Compounds with Different Methods

Description

Estimate the load based on the time-weighted flow and concentration method (Moatar & Meybeck, 2005). The estimation is performed on the time period spanned by flow records. It is possible to estimate the load also monthly or annually.

Usage

method1(db, ncomp, period)

Arguments

db	An input data frame with at least three column. A column with DateTime in standard format (yyyy-mm-dd HH:MM:SS) labeled "datetime", a column with flow records in cubic meter per second labeled "flow", and columns with scattered concentration data in milligram per litre. Alternatively, it can be used the output matrix of the function db.union.
ncomp	Number of compounds in the input data frame for which the load must be estimated.
period	Optional argument. It can be "month" for a monthly estimation of load, or it can be "year" for annual estimation of load. If it misses, the calculation is performed on the time period spanned by the streamflow data.

Value

A matrix with the estimated load with time-weighted flow and concentration method for the different compounds. If the optional argument 'period' misses, the matrix will have only one row with the load estimation done throughout the time period spanned by streamflow data. Otherwise, if the period is specified, the load is estimated in the different months/year and the load values are returned in different rows, named with the month/year considered. The load is expressed in gram per period of estimation.

Author(s)

Veronica Nava

References

Moatar, F., & Meybeck, M. (2005). Compared performances of different algorithms for estimating annual nutrient loads discharged by the eutrophic River Loire. Hydrological Processes, 19(2), 429-444. https://doi.org/10.1002/hyp.5541

See Also

db.union

Examples

data("flow.data1","conc.data1")
union<-db.union(flow.data1, conc.data1)
met1<-method1(union, 2)
met1.month<-method1(union, 2, "month")
met1.year<-method1(union, 2, "year")

Example output

Registered S3 method overwritten by 'quantmod':
  method            from
  as.zoo.data.frame zoo 

RiverLoad documentation built on Jan. 4, 2022, 5:07 p.m.