transform: Transforms a rainfall event to runoff

In RHMS: Hydrologic Modelling System for R Users

Description

This function transforms an excess rainfall event to a direct runoff hydorgraph.

Usage

transform(rainfall,transformMethod,transformParams,Area,UH,simulation)

Arguments

rainfall	an object inherited from loss function
transformMethod	a string: the type of transformation method. available types: "SCS", "snyder", and "user". default to "SCS"
transformParams	a list of parameters associated to the selcted type of transformMethod: Tlag for "SCS" method Ct, Cp, L, and Lc for "snyder" method
Area	the area of drainage basin (Km^2)
UH	a data.frame: must be provided when transformMethod is set to "user". UH is the ordinates of a user defined UH by the which its first collumn is time (Hr) and the second collumn includes flow rates (cms)
simulation	a list of simulation time and dates as below: start: the date which simulation starts, must be in 'YYYY-MM-DD' format start: the date which simulation ends, must be in 'YYYY-MM-DD' format by: the interval of each steps in seconds

Value

Hydrogaph of direct runoff

Author(s)

Rezgar Arabzadeh

See Also

sim

Examples

Area=200
lossMethod<-"SCS"
lossParams<-list(CN=65)
transformMethod<-c("snyder","SCS","user")
simulation<-list(start='2000-01-01',end='2000-01-7',by=7200)
precipitation<-sin(seq(0.1,pi-0.1,length.out=10))*20
transformParams=list(Tlag=4,Cp=0.15,Ct=2,L=100,Lc=15)
UH<-data.frame(t=1:20,q=sin(seq(0,pi,length.out=20))*1)

SCS_loss<-loss(precipitation,lossMethod,lossParams)

snyder_transformation<-transform(rainfall=SCS_loss,
                                 transformMethod=transformMethod[1],
                                 transformParams,Area,UH=NA,simulation)
SCS_transformation   <-transform(rainfall=SCS_loss,
                                 transformMethod=transformMethod[2],
                                 transformParams,Area,UH=NA,simulation)
user_transformation  <-transform(rainfall=SCS_loss,
                                 transformMethod=transformMethod[3],
                                 transformParams,Area,UH,simulation)

Example output

Loading required package: pso
Loading required package: Hmisc
Loading required package: lattice
Loading required package: survival
Loading required package: Formula
Loading required package: ggplot2

Attaching package: 'Hmisc'

The following objects are masked from 'package:base':

    format.pval, units

Loading required package: network
network: Classes for Relational Data
Version 1.15 created on 2019-04-01.
copyright (c) 2005, Carter T. Butts, University of California-Irvine
                    Mark S. Handcock, University of California -- Los Angeles
                    David R. Hunter, Penn State University
                    Martina Morris, University of Washington
                    Skye Bender-deMoll, University of Washington
 For citation information, type citation("network").
 Type help("network-package") to get started.


Attaching package: 'network'

The following object is masked from 'package:Hmisc':

    is.discrete

Loading required package: GGally

Attaching package: 'RHMS'

The following objects are masked from 'package:base':

    transform, transform.default

RHMS documentation built on Sept. 27, 2021, 5:06 p.m.