EZG-File

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Input files · ALL SYS · FKT KTR · EXT JGG WGG TGG · TAL HYA TRS EIN URB VER RUE BEK EZG FKA · BOA BOD LNZ EFL · DIF

Rural catchment

also refer to Theory: Rural catchment

File

<bluem>

  • Einzugsgebiete (*.EZG)
  • ======================
  • |------|-----|------------------------------|--------|------------------|------------------------|---------|-----|----------|-----|----------------------------------------------|--------------|-------------------------------------|--------------|
  • | Bez | KNG | Gebietskenngroessen | N | Verdunstung | Temperatur | QBASIS | PSI | SCS (2) | BF0 | Retentionskonstanten | Aufteilung | Schneekonstanten | QSpende |
  • | | | A VG Ho Hu L | Datei |Kng Sum Datei |Kng Tem JGG TGG Datei | qB JGG | (1) | CN VorRg| (3) | R K(VG) K1 K2 Int Bas nLin Expo| Beta1 Beta2 | R GrT NSchD GrD RateT RateSB | MQ |
  • |------|-----|------------------------------|--------|------------------|------------------------|---------|-----|----------|-----|----------------------------------------------|--------------|-------------------------------------|--------------|
  • | - | 1-4 | ha  % muNN muNN m | Nummer |1/2 mm/a Nummer |1/2 °C - - Nummer |l/sqkm - | - | - mm |  % | - h h h h h J/N - | - - | - °C  %  % mm/(°d) mm/d | m3/(s ha) |
  • |-<-->-|-<->-|<----><----><----><----><---->|<------>|-+-<---->-<------>|-+-<-->-<->-<->-<------>|<--->-<->|<--->|<---><--->|<--->|-+-<---->-<---->-<---->-<---->-<---->--+-<--->|-<---->-<---->|-+-<--->-<--->-<--->-<----->-<----->-|-<---------->-|
|   A  |  B  |   C     D     E     F     G  |    H   | I    J       K   | L   M   N   O      P   |  Q    R |  S  |  T    U  |  V  |R1   R2     R3     R4     R5     R6   R7   R8 |   B1     B2  |S1   S2    S3    S4     S5      S6   |    Q1        |
  • |------|-----|------------------------------|--------|------------------|------------------------|---------|-----|----------|-----|----------------------------------------------|--------------|-------------------------------------|--------------|</bluem>

Explanations

Versionen:

  • v0.9.4:
    • ab r544: Aufteilungsfaktoren Beta beziehen sich nur noch auf unversiegelte Fläche; Beta2 optional
    • ab r532: wieder ohne urbane Gebiete
  • vorher
  • A: unique ID (must begin with 'A'!)
  • B: calculation type [1-4] (see below). Refers to the non-sealed-off areas; the sealed-off areas are generally calculated with the same methods.
  • C: area [ha]
  • D: degree of sealed-off area [%]
  • E: maximum height Höhe [müNN]
  • F: minimum height [müNN]
  • G: longest flow path [m]

Rainfall:

  • H: Filenumber of the rainfall file (refer to *.EXT-File)

Evaporation:

  • I: calculation type for the evaporation (1 = annual evaporation; 2 = evaporation out of a time series / file)
    • J: annual evaporation [mm/a]
    If soil moisture calculation: the sum refering to grasland must be entered,which is internally overprinted with hydrographs accordint to Brandt[1] and Haude[2][3] and is adjusted to the land use in the individual hydrological response unit.
    • K: filenumber of the evapotation time series to be utilized (refer to *.EXT-File)
    only daily values may be listed in the time series because the time series values are always additionally overprinted with a daily pattern! (Bug 1)

Temperature:

Base flow:

  • Q: constant base flow [l/s.km²]
If soil moisture calculation this value only surves the purpose of calculating the initial reservoir content of the groundwater and interflow reservoirs:
S0,Basis = QB,0 × KBasis
S0,Interflow = QB,0 × KInterflow
  • R: number of the annual pattern to be utilized to scale the base flow (not used by soil moisture)

Calculation type 1: run-off coefficient method:

  • S: run-off coefficient (0 < ψ ≤ 1)
[math]\displaystyle{ \psi = \frac{N_{eff} + E_T + h_v}{N} }[/math]
with:
Neff=effective rainfall
ET = evaporation
hv = initial losses (losses due to wetting and troughs)
also refer to http://de.wikipedia.org/wiki/Abflussbeiwert

Calculation type 2: SCS-Method:

refer to Theory:SCS-Method
  • T: CN-Value (0 < CN ≤ 100)
  • U: 21-Day prior rainfall height [mm] (is distributed evenly over 21 days)

Calculation type 3: soil moisture calculation:

refer to Theory: soil moisture calculation
  • V: initial soil moisture [% of field capacity] this value is overprinted by the global initial soil moisture specified in the ALL-File.

Calculation type 4: specific discharge:

  • Q1: constant specific discharge [m3/(s ha)]

Retention constant:

Berechnung der Retentionskonstanten[4]
Parallelspeicherkaskaden
  • R1: manual input of the retention constants as well as the distribution factors [Y/N]
    if No (N) the retention constants as well as the distribution factors are calculated internally according to Zaiß[4] on the basis of catchment characteristics anhand. The calculated parameters are written into the Protocol-File,if it's activated.
  • R2: Retention constant of the sealed-off area cascade [h]
  • R3: Retention constant of the fast cascade [h]
  • R4: Retention constant of the slow cascade [h]
  • R5: Retention constant of interflow [h] (only for soil moisture calculation)
  • R6: Retention constant of base flow [h] (only for soil moisture calculation)
  • R7: non-linear calculation [Y/N]
  • R8: Exponent fot the non-linear calculation

Distribution factors:
The distribution factors Beta1 and Beta2 only refer to non-sealed areas!

The sum of Beta1 and Beta2 must be 1 (β1 + β2 = 1)!

  • B1: Distribution factor of the fast cascade 0 ≤ β1 ≤ 1
  • B2: Distribution factor of the slow cascade 0 ≤ β2 ≤ 1

The distribution factor β3 of the cascade fot sealed-off areas is determined internally on basis of the degree of sealed-off area (D).

Hint
Giving Beta2 is optional. If not given it's calculated by β2 = 1. - β1

Snow constants:
For the calculation of snow the Snow-Compaction Method according to Knauf[5] is applied.

  • S1: manual input of the snow constants [Y/N]
    (if N or not available, standard parameters will be utilized)
  • S2: border temperature for the formation of snow [°C]
  • S3: new-snow density [%]
  • S4: border density as of which water output begins [%]
  • S5: temperature dependent melting rate [mm/(K×d)]
  • S6: Insolation and soil warmth dependent melting rate [mm/d]

Value ranges and standard parameters:

Parameter Unit Standar value Value range[5]
border temperature °C 0 ?
new-snow density % 11 5 - 20
border density % 40 40 - 45
temperature dependent melting rate mm/(K×d) 1.8 ?
Insolation and soil warmth dependent melting rate mm/d 4.2 ?

Specific discharge:
constant specific discharge (calculation type = 4)

  • Q1: constant specific discharge [m3/(s ha)]

Literature

  1. ↑ Brandt, T. (1979): Modell zur Abflussgangliniensimulation unter Berücksichtigung des grundwasserbürtigen Abflusses, Technischer Bericht Nr. 24 aus dem Institut für Wasserbau, Fachgebiet Ingenieurhydrologie und Hydraulik der TH Darmstadt
  2. ↑ Haude, W. (1954): Zur praktischen Bestimmung der aktuellen und potentiellen Evapotranspiration. – Mitteilungen des DWD, Bd. 8; Bad Kissingen
  3. ↑ Haude, W. (1955): Zur Bestimmung der Verdunstung auf möglichst einfache Weise. Mitteilungen des DWD, 2 (11), Bad Kissingen
  4. ↑ 4.0 4.1 Zaiß, H. (1986): Abflussermittlung aus Teilflächen, in "Hydrologische Abflussmodelle in der praktischen Anwendung", 36. Fortbildungslehrgang des BWK-Hessen am 21. März 1986, Friedberg [ihwb-Bibliothek: Inv.-Nr. 5593, 10 BWK 36] PDF information.png OCR information.png
  5. ↑ 5.0 5.1 Knauf, D. (1980): Die Berechnung des Abflusses aus einer Schneedecke, in: DVWK-Schriften, Heft 46, Analyse und Berechnung oberirdischer Abflüsse PDF information.png
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