RHG: Computes regional hydraulic geometry dimensions

In FluvialGeomorph/RegionalCurve: A Collection of Hydraulic Regional Curve Relationships

Computes regional hydraulic geometry dimensions

Description

Computes regional hydraulic geometry (RHG) dimension (cross sectional area, width, depth, discharge) from a built-in table of regional hydraulic geometry equation coefficients.

Usage

RHG(
  region,
  drainageArea,
  dimensionType = c("area", "depth", "width", "discharge")
)

Arguments

region	character; The region that a dimension will be calculated for. For a complete list of regions, see levels(regional_curve$region_name)
drainageArea	numeric; The upstream drainage area of the location of the dimension (in square miles).
dimensionType	character; Dimension type: "area", "depth", "width", "discharge"

Details

This function uses values in the regional_curve data frame to calculate hydraulic geometry dimensions. Monomial relationships of the form y=ax^m, known as power functions, appear as straight lines in a log–log graph, with the exponent (m) and constant (a) term corresponding to slope and intercept of the line (y = mx + b).

Value

The numeric value of the requested hydraulic dimension. The units of the dimensions are as follows: area: square feet, depth: feet, width: feet, discharge: cubic feet per second

Examples

# Calculate the discharge for a 200 sq mi watershed in Massachusetts.
RHG(region = "MA", drainageArea = 200, dimensionType = "discharge")

# Calculate the discharge for a 200 sq mi watershed in Massachusetts.
RHG(region        = c("MA","MA","MA", "MA"),
    drainageArea  = c(200, 200, 200, 200),
    dimensionType = c("width", "depth", "area", "discharge"))

FluvialGeomorph/RegionalCurve documentation built on Oct. 2, 2023, 9:35 a.m.