6. Groundwater#
Fig. 6.1 Installation of groundwater well – photo by (Neijenhuis, 2023).#
Nomenclature
Symbol |
Quantity |
Quantity name in Dutch |
Dimension |
Widely used unit (if not SI) |
|---|---|---|---|---|
\(A\) |
Area |
Dwarsdoorsnede |
[L\(^2\)] |
|
\(c\) |
Hydraulic resistance |
Hydraulische weerstand |
[T] |
[day] |
\(dt\) |
Time step |
Tijdstap |
[T] |
|
\(dh\) |
Change in groundwater level |
Verandering in groundwaterpeil |
[L] |
[m] |
\(E\) |
Evaporation |
Verdamping |
[L/T] |
[m/d] |
\(g\) |
Acceleration of gravity |
Valversnelling |
[L/T\(^2\)] |
|
\(H\) |
Height of the aquifer |
Hoogte van de aquifer |
[L] |
|
\(h\) |
Hydraulic head |
Stijghoogte |
[m] |
|
\(k\) |
Hydraulic conductivity |
Doorlatendheid |
[L/T] |
[m/day] |
\(L\) |
Length |
Lengte |
[L] |
|
\(N\) |
Recharge of groundwater |
Grondwateraanvulling |
[L/T] |
|
\(n\) |
Porosity of the soil |
Porositeit van de grond |
[-] |
|
\(P\) |
Precipitation |
Neerslag |
[L/T] |
[m/d] |
\(p\) |
Pressure w.r.t. atmospheric pressure |
Druk t.o.v. atmosferische druk |
[ML\(^{-1}\)T\(^{-2}\)] |
[N/m\(^2\)] |
\(Q\) |
Discharge |
Debiet |
[L\(^3\)/T] |
[m\(^3\)/day] |
\(q\) |
Specific discharge |
Specifiek debiet |
[L/T] |
[m/day] |
\(r\) |
Distance from the middle of the well |
Afstand tot het midden van de bron |
[L] |
|
\(r_0\) |
Radius of the well |
Straal van de bron |
[L] |
|
\(S\) |
Storativity |
Bergingscoëfficient |
[-] |
|
\(S_s\) |
Specific storage |
Specifieke bergingscoëfficient |
[1/L] |
|
\(S_y\) |
Specific yield |
Freatische bergingscoëfficient |
[-] |
|
\(V_p\) |
Volume of the pores |
Poriënvolume |
[L\(^3\)] |
|
\(V_t\) |
Total ground volume |
Totaal volume van de grond |
[L\(^3\)] |
|
\(V_s\) |
Volume of the soil particles |
Volume van de gronddeeltjes |
[L\(^3\)] |
|
\(V_w\) |
Volume of the water |
Volume water |
[L\(^3\)] |
|
\(v\) |
Flow velocity |
Stroomsnelheid |
[L/T] |
|
\(z\) |
Elevation above a reference level |
Hoogte t.o.v. een referentieniveau |
[L] |
|
\(\alpha\) |
Drainage factor |
Drainagefactor |
[1/T] |
[1/day] |
\(\mu\) |
Storage coefficient (porosity – soil moisture at field capacity) |
Bergingscoëfficiënt |
[-] |
|
\(\gamma\) |
Specific weight of a fluid |
Soortelijk gewicht van een vloeistof |
[ML\(^{-2}\)T\(^{-2}\)] |
[N/m\(^3\)] |
\(\lambda\) |
Leakage factor |
Spreidingslengte |
[L] |
|
\(\psi\) |
Matric potential |
Zuigspanning |
[L] |
[m] |
\(\rho\) |
Density |
Dichtheid |
[M/L\(^3\)] |
|
\(\theta\) |
Moisture content |
Bodemvochtgehalte |
[-] |