Hypsographic Functions from Tabular Interpolation


The main function creates a function list object from a data table to allow interpolation of depths, areas and volume fractions of layers.





hypsographic table (bathymetry) given as data frame with columns level, area and volume


a list of functions with the following elements (slots):

  • level(volume) interpolates level from volume

  • volume(level) interpolates volume from a given water level

  • area(level) interpolates area from a given level

  • vh(level, zmixreal) calculates hypolimnic volume from surface water level (m above ground) and mixing depth (zmixreal, thermocline in m below surface)

  • ve(level, zmixreal) calculates epilimnic volume from surface water level and zmixreal

  • zmix(level, zmixreal) calculates average mixing depth (zmix) from surface water level and zmixreal

  • zhm(level, zmixreal) calculates average depth of bottom layer (hypolimnion and metalimnion)

  • sediment_area(level) calculates sediment area for a series of water levels, where level shoudl be a vecor of water levels in ascending order

  • pelagic_ratio(level) calculates the area ratio of the pelagic part (water) to the total area of layers. It is equal to 1 - sediment area fraction.

See Also

hypso_bautzen, an example of a hypsographic table
areaFunction, functions to create a hypsographic table for lakes with conical shape.


data(hypso_bautzen)                      # load data table
hypso <- hypso_functions(hypso_bautzen)  # create function object

hypso$volume(166)                        # volume at 166 m a.s.l.
hypso$sediment_area(c(160, 166))         # sediment area of hypo- and epilimnion

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