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Calculate Flow Statistics Per Section

Source: R/helper_functions.R
calculate_flow_stats.Rd

Computes discharge statistics from a daily or hourly flow dataset for each river section. The function supports both daily data (using a date column) and hourly data (using a datetime column), depending on the "temporal_resolution" attribute of the input.

Usage

calculate_flow_stats(flows)

Arguments

flows

A data frame containing a date or datetime column (depending on attr(flows, "temporal_resolution")) followed by one column per river section with discharge values.

Value

A list with three elements:

per_section

A tibble with discharge statistics per section (MQ, MNQ_years, MHQ_years, NNQ, HHQ).

per_year

A tibble with statistics per section and year (MQ, MNQ_months, MHQ_months, NQ, HQ).

per_month

A tibble with statistics per section and month (MQ, MNQ_same_months, MHQ_same_months, NQ, HQ).

Details

The returned statistics include:

  • MQ – Mean discharge

  • MNQ_years – Mean of yearly minimum values (yearly low flows)

  • MHQ_years – Mean of yearly maximum values (yearly high flows)

  • NNQ – Overall minimum discharge (absolute low flow)

  • HHQ – Overall maximum discharge (absolute high flow)

Additional tables contain statistics per year and per month, including monthly mean, monthly minimum, and monthly maximum discharges.