shallowgroundwater
as an sf
multipolygon layerR/read_shallowgroundwater.R
read_shallowgroundwater.Rd
Returns the raw data source shallowgroundwater
as an sf
multipolygon
layer.
The coordinate reference system is 'BD72 / Belgian Lambert 72'
(EPSG-code 31370).
read_shallowgroundwater( file = file.path(locate_n2khab_data(), "10_raw/shallowgroundwater/shallowgroundwater.gpkg") )
file | The absolute or relative file path of the data source.
The default follows the data management advice in the
vignette on data storage (run |
---|
A Simple feature collection of geometry type MULTIPOLYGON
.
All attribute variables are logical
variables referring to a data source (subset) or procedure that has
contributed to
the shallowgroundwater
data source.
If a variable is TRUE
for a multipolygon, then the related data
source (subset) or procedure has
contributed to the multipolygon.
For one multipolygon, several variables can be TRUE
at the same time.
Each combination of values occurs in only one multipolygon.
The attribute variables listed below are described in more detail at
Zenodo; their description
typically refers to the meaning of TRUE
:
geomorph_wcoast
: mainly concerns dune slacks, mud flats and
salt marshes.
Derived from: Cosyns et al. (2019)
anthrop_gwdep
: zones located within a 100 m buffer around
(almost) everywhere groundwater dependent habitat types (or regionally
important biotopes) ánd situated within zones classified as 'anthropogenic'
areas within the soil map.
Derived from: soilmap_simple
and
habitatmap_terr
data sources
narrowanthrop_gwdep
: narrow zones classified as 'anthropogenic'
areas within the soil map that include (almost) everywhere groundwater
dependent habitat types (or regionally important biotopes).
Derived from: soilmap_simple
and
habitatmap_terr
data sources
drainage
: soils that are at least moderately gleyic or wet.
Derived from: soilmap_simple
data source
dunes_gwdep
: zones located within a 100 m buffer around (almost)
everywhere groundwater dependent habitat types (or regionally important
biotopes) ánd situated within zones classified as 'dunes' areas within the
soil map.
Derived from: soilmap_simple
and
habitatmap_terr
data sources
peat_profile
: variant of the soil profile indicates a
superficial peaty cover, mostly on gleyic or permanently water saturated
soil with or without profile development ((v)
), eventually combined
with strong anthropogenic influence ((o)
).
Derived from: soilmap_simple
data source
peat_substr
: soil substrate (layer underlying superficial layer,
and lithologically diverging from it) consists of peat material starting at
small (less than 75 cm; v
) or moderate depths (75-125 cm;
(v)
), or a combination of the previous (v-
).
Derived from: soilmap_simple
data source
peat_parentmat
: parent material contains a mixture of at least
30% of peaty material.
Derived from: soilmap_simple
data source
peat_texture
: soil consists of plain peat material.
Derived from: soilmap_simple
data source
phys_system
: polygons designated as seepage areas where
groundwater is supposed to gather after having infiltrated elsewhere
(infiltration areas) and being transported through the landscape (passage
areas).
Derived from: Lhermitte & Honnay (1994)
zwin
: the contour of the Zwin Nature Reserve in the most
eastern part of the Flemish coastal area.
Derived from: Open Street Map, consulted 2021-10-06 by QGIS plugin
QuickOSM
habitat_1130
: polygons located within estuaries (habitat type
1130
).
Derived from: habitatmap
data source
gwdepth_coast
: locations with estimated average lowest
groundwater table less than 2.5 m below soil surface (shallow groundwater),
based on interpolation of measured groundwater levels in areas along the
Flemish coast with sufficient gauge densities.
Derived from:
the Watina
database of the Research Institute for Nature and Forest (INBO)
gwdepth_local
: mean lowest groundwater level less than 2 m
below soil surface (MLW) in a large military training site for which no
information is available in the soil map of Flanders.
Derived from: Batelaan et al. (2012)
seepage
: area with modelled seepage fluxes of at least
0.8 mm/day in the central part of eastern Flanders.
Derived from: Batelaan & De Smedt (1994)
peat_survey
: local peaty zones evaluated by simple measurements
of the depth of plain and superficial peaty soil layers at regular intervals
(about 20 m).
Derived from: local inventories executed or compiled by the Research
Institute for Nature and Forest (INBO)
duneslack
: polygons with dune slack vegetations along the
Flemish coast that typically imply shallow groundwater levels.
Derived from: Provoost et al. (2020)
The data source shallowgroundwater
represents the areas in
the Flemish region of Belgium where the mean lowest groundwater level (MLW;
Knotters & Van Walsum, 1997; Van Heesen, 1970) is estimated to be less than
approximately 2 m below soil surface (hence, 'shallow' groundwater).
Groundwater dependent species and communities can be expected to be present
mostly within these areas.
The data source is a GeoPackage, available at
Zenodo, and contains a single
spatial multipolygon layer shallowgroundwater
.
The data source has been compiled from subsets of
various other spatial data sources.
This process is described in more detail at Zenodo.
The R code for finishing the shallowgroundwater
data source,
starting from an intermediate result, can be found in the
n2khab-preprocessing
repository.
Batelaan O., De Becker P., El-Rawy M., Herr C., Schneidewind, U. (2012). Doorrekenen van maatregelen voor herstel van vochtige heidevegetaties op het Schietveld van Houthalen-Helchteren via grondwatermodellering. Vrije Universiteit Brussel/Instituut voor Natuur en Bosonderzoek.
Batelaan O., De Smedt F. (1994). Regionale grondwaterstroming rond een aantal kwelafhankelijke natuurgebieden. Vrije Universiteit Brussel.
Cosyns E., Bollengier B., Provoost S. (2019). Masterplan en juridische basis voor grensoverschrijdende samenwerking en bescherming als een transnationaal natuurpark van de duinen tussen Dunkerque (Frankrijk) en Westende (België). Partim Masterplan. Rapport in opdracht van Agentschap Natuur en Bos, Conservatoire de l'espace littoral et des rivages lacustres, Conseil Général Département du Nord. https://www.natuurenbos.be/sites/default/files/inserted-files/masterplan_flandre_ned20200210def.pdf
Knotters M. & van Walsum P.E.V. (1997). Estimating fluctuation quantities from time series of water-table depths using models with a stochastic component. Journal of Hydrology 197 (1): 25–46. doi:10.1016/S0022-1694(96)03278-7 .
Lhermitte K., Honnay O. (1994). Kartering van het Fysisch Systeem en de Ruimtelijke structuren in Vlaanderen op schaal 1 : 50 000. Stichting Plattelandsbeleid 1994, Boerenbond, Leuven.
Provoost S., Van Gompel W. & Vercruysse E. (2020). Beheerevaluatie kust. Eindrapport 2015-2019. Rapporten van het Instituut voor Natuur- en Bosonderzoek 2020 (18). Instituut voor Natuur- en Bosonderzoek, Brussel. doi:10.21436/inbor.18039583 .
Van Heesen H.C. (1970). Presentation of the seasonal fluctuation of the water table on soil maps. Geoderma 4 (3): 257–278. doi:10.1016/0016-7061(70)90006-6 .
Other functions returning environmental data sets:
read_soilmap()
,
read_watercourse_100mseg()
,
read_watersurfaces()
if (FALSE) { shallowgroundwater <- read_shallowgroundwater() shallowgroundwater }