In mkoohafkan/flowregime: Environmental Flow Regime Indicators

%\VignetteEngine{knitr} %\VignetteIndexEntry{IHA verification}

Verification of the IHA algorithm

This vignette verifies the flowregime package implementation of Indicators of Hydrologic Alteration (IHA). The analysis of the Roanoke Rapids flow record described in Richter et al (1996) is repeated using both IHA v7 and the IHA function provided by flowregime.

library(flowregime)
data(roanokerapids)
pre.period = roanokerapids['1912-10-01/1949-09-30']
post.period = roanokerapids['1955-10-01/1991-09-30']
hpthresh = quantile(pre.period, 0.75)[[1]]
lpthresh = quantile(pre.period, 0.25)[[1]]
pre.results = IHA(pre.period, ut = hpthresh, lt = lpthresh, 
  yearstart = "10-01", yearend = "09-30", parametric = FALSE)
post.results = IHA(post.period, ut = hpthresh, lt = lpthresh, 
  yearstart = "10-01", yearend = "09-30", parametric = FALSE)
summary(pre.results)
compareIHA(pre.results, post.results)

The Range of Variability Approach (RVA) provided by the IHA software can also be implemented using flowregime.

rva.categories = build_RVA_categories(pre.results, parametric = FALSE)
rva.results = RVA(pre.results, post.results, rva.categories)

References

The Nature Conservancy, 2009. Indicators of Hydrologic Alteration Version 7.1 User's Manual.

Poff, N. L. and J. V. Ward. 1989. Implications of Streamflow Variability and Predictibility for Iotic Community Structure: a Regional Analysis of Streamflow Patterns. Canadian Journal of Aquatic Sciences 46: 1805-1818.

Richter, B. D., Baumgartner, J. V., Powell, J. and Braun, D. P. (1996), A Method for Assessing Hydrologic Alteration within Ecosystems. Conservation Biology 10: 1163-1174. doi: 10.1046/j.1523-1739.1996.10041163.x

Richter, B.D, J.V. Baumgartner, R. Wigington, and D.P. Braun. 1997. How much water does a river need? Freshwater Biology 37, 231-249.

no low pulses low pulse dur num reversals

mkoohafkan/flowregime documentation built on May 23, 2019, 2:02 a.m.