Einzugsgebiet/en - Versionsgeschichte

Froehlich: Die Seite wurde neu angelegt: „====Compensation functions==== The following compensation functions according to Brandt are used to distribute entered annual values for evaporation over the y…“

2020-12-17T09:45:20Z

Die Seite wurde neu angelegt: „====Compensation functions==== The following compensation functions according to Brandt are used to distribute entered annual values for evaporation over the y…“

← Nächstältere Version		Version vom 17. Dezember 2020, 11:45 Uhr
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	* Specification of a fixed evaporation rate per year: when using this option, the entered annual value is distributed inner-annually using the compensation function according to Brandt (see below).		* Specification of a fixed evaporation rate per year: when using this option, the entered annual value is distributed inner-annually using the compensation function according to Brandt (see below).

	====~~Ausgleichsfunktionen~~====		====Compensation functions====
	~~Die folgenden Ausgleichsfunktionen nach~~ Brandt ~~werden verwendet, um eingegebene Jahressummen der Verdunstung über das Jahr zu verteilen bzw. um Tageswerte auf Stundenwerte umzurechnen~~.		The following compensation functions according to Brandt are used to distribute entered annual values for evaporation over the year and to convert daily values to hourly values.

	Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determined /BRANDT, 1979/.		Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determined /BRANDT, 1979/.

Froehlich: Die Seite wurde neu angelegt: „Talsim-NG offers multiple options for entering/calculating potential evaporation: * Specification of an external time series with values for the potential evap…“

2020-12-17T09:43:37Z

Die Seite wurde neu angelegt: „Talsim-NG offers multiple options for entering/calculating potential evaporation: * Specification of an external time series with values for the potential evap…“

← Nächstältere Version		Version vom 17. Dezember 2020, 11:43 Uhr
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	The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly.		The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly.

	~~Es stehen verschiedene Optionen zur Eingabe~~/~~Berechnung der potentiellen Verdunstung zur Verfügung~~:		Talsim-NG offers multiple options for entering/calculating potential evaporation:
	* ~~Vorgabe einer externen Zeitreihe mit Werten für die potentielle Verdunstung~~		* Specification of an external time series with values for the potential evaporation
	* ~~Interne Berechnung der potentiellen Verdunstung~~: ~~Die potentielle Verdunstung wird auf Basis von Temperatur und je nach Verfahren weiteren Parametern intern berechnet~~. ~~Es stehen die folgenden Verfahren zur Verfügung~~:		* Internal calculation of potential evaporation: the potential evaporation can be calculated internally based on temperature and, depending on the method, additional parameters. The following methods are available:
	** Penman: ~~Erfordert die Angabe mittlerer Jahresgänge oder von Zeitreihen für Sonnenscheindauer~~, ~~Windgeschwindigkeit und~~ relative ~~Luftfeuchte~~		** Penman: requires the specification of average patterns or of time series for sunshine duration, wind speed and relative humidity
	** Haude: ~~Erfordert die Angabe eines mittleren Jahresgangs oder einer Zeitreihe~~ relative ~~Luftfeuchte~~		** Haude: requires the specification of average patterns or of a time series for relative humidity
	** Turc: ~~Erfordert die Angabe mittlerer Jahresgänge oder von Zeitreihen für Sonnenscheindauer und~~ relative ~~Luftfeuchte~~		** Turc: requires the specification of average patterns or of time series for sunshine duration and relative humidity
	** Blaney-Criddle: ~~Vereinfachtes Verfahren, erfordert lediglich die Angabe des Breitengrads, woraus die Sonnenscheindauer abgeleitet wird~~.		** Blaney-Criddle: simplistic method requiring only the specification of a latitude which is used internally to derive the sunshine duration.
	* ~~Angabe einer fixen Verdungstungshöhe pro Jahr~~: ~~Bei dieser Option wird die eingegebene Jahressumme mit der Ausgleichsfunktion nach~~ Brandt (~~siehe unten~~) ~~innerjährlich verteilt~~.		* Specification of a fixed evaporation rate per year: when using this option, the entered annual value is distributed inner-annually using the compensation function according to Brandt (see below).

	====Ausgleichsfunktionen====		====Ausgleichsfunktionen====

Froehlich: Die Seite wurde neu angelegt: „Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determi…“

2020-12-17T09:35:11Z

Die Seite wurde neu angelegt: „Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determi…“

← Nächstältere Version		Version vom 17. Dezember 2020, 11:35 Uhr
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	Die folgenden Ausgleichsfunktionen nach Brandt werden verwendet, um eingegebene Jahressummen der Verdunstung über das Jahr zu verteilen bzw. um Tageswerte auf Stundenwerte umzurechnen.		Die folgenden Ausgleichsfunktionen nach Brandt werden verwendet, um eingegebene Jahressummen der Verdunstung über das Jahr zu verteilen bzw. um Tageswerte auf Stundenwerte umzurechnen.

	~~Aus ausgewerteten Messungen von~~ 20 ~~Stationen~~, ~~deren Mittelwerte als Histogramm~~ in ~~dargestellt sind~~, ~~wurde folgende Ausgleichsfunktion ermittelt~~ /BRANDT, 1979/.		Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determined /BRANDT, 1979/.

	<math>VP=(0.96+0.0033 \cdot i) \cdot \sin\frac{2\pi}{365}(i-148)+158</math>		<math>VP=(0.96+0.0033 \cdot i) \cdot \sin\frac{2\pi}{365}(i-148)+158</math>

Froehlich: Die Seite wurde neu angelegt: „The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly.“

2020-12-17T09:34:55Z

Die Seite wurde neu angelegt: „The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly.“

← Nächstältere Version		Version vom 17. Dezember 2020, 11:34 Uhr
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	Evaporation has a double effect on runoff generation. On the one hand, the initial conditions in the catchment area (interception and depression storage on the surface as well as to a limited degree the soil moisture of permeable areas) are a result of the evaporation taking place before the considered precipitation event. On the other hand, the current runoff-effective precipitation is affected by the amount of the current evaporation rate.		Evaporation has a double effect on runoff generation. On the one hand, the initial conditions in the catchment area (interception and depression storage on the surface as well as to a limited degree the soil moisture of permeable areas) are a result of the evaporation taking place before the considered precipitation event. On the other hand, the current runoff-effective precipitation is affected by the amount of the current evaporation rate.

	~~Die potentielle~~ (~~energetisch mögliche~~) ~~Verdunstung~~ VP ~~ist zeitlich und örtlich sehr unterschiedlich und einer genauen Berechnung nur schwer zugänglich~~.		The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly.

	Es stehen verschiedene Optionen zur Eingabe/Berechnung der potentiellen Verdunstung zur Verfügung:		Es stehen verschiedene Optionen zur Eingabe/Berechnung der potentiellen Verdunstung zur Verfügung:

Froehlich am 17. Dezember 2020 um 09:34 Uhr

2020-12-17T09:34:45Z

@@ Zeile 43: / Zeile 43: @@
 === Evaporation VP(t)===
-Evaporation has a double effect on runoff generation. On the one hand, the initial conditions in the catchment area (interception and depression storage on the surface as well as to a limited degree the soil moisture of permeable areas) are a result of the evaporation taking place before the considered precipitation event. On the other hand, the current runoff-effective precipitation is affected by the amount of the current evaporation rate. The potential (energetically possible) evaporation VP varies in time and place and is very difficult to calculate exactly. Using evaluated measurements of 20 stations, the mean values of which are presented in the following histogram, the following compensation function was determined /BRANDT, 1979/.
+Evaporation has a double effect on runoff generation. On the one hand, the initial conditions in the catchment area (interception and depression storage on the surface as well as to a limited degree the soil moisture of permeable areas) are a result of the evaporation taking place before the considered precipitation event. On the other hand, the current runoff-effective precipitation is affected by the amount of the current evaporation rate.
 <math>VP=(0.96+0.0033 \cdot i) \cdot \sin\frac{2\pi}{365}(i-148)+158</math>

Froehlich am 25. November 2020 um 14:58 Uhr

2020-11-25T14:58:21Z

← Nächstältere Version		Version vom 25. November 2020, 16:58 Uhr
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	As a result, the value of C ranges between 0.8 < C < 0.9. This ensures that different rainfall indices are calculated for the same amount of rainfall at different times of the year, thus taking into account different degrees of runoff readiness.		As a result, the value of C ranges between 0.8 < C < 0.9. This ensures that different rainfall indices are calculated for the same amount of rainfall at different times of the year, thus taking into account different degrees of runoff readiness.
	Depending on the ~~previous~~ conditions quantified in this way, a current discharge coefficient can be calculated using the CN values specific to the area and valid for average previous conditions. The following figure shows how the current discharge coefficient for different CN-values changes depending on ~~previous~~ conditions.		Depending on the antecedent conditions quantified in this way, a current discharge coefficient can be calculated using the CN values specific to the area and valid for average previous conditions. The following figure shows how the current discharge coefficient for different CN-values changes depending on antecedent conditions.
	Since the runoff readiness of a catchment area changes during the course of a rainfall event due to soil moistening, the runoff coefficient is also adjusted during an event as a function of the cumulative precipitation amount.		Since the runoff readiness of a catchment area changes during the course of a rainfall event due to soil moistening, the runoff coefficient is also adjusted during an event as a function of the cumulative precipitation amount.
	<gallery mode="packed" heights=300px>		<gallery mode="packed" heights=300px>
	Datei:Abhängigkeit_des_Abflussbeiwertes_von_der_Vorgeschichte_EN.png\|Dependence of the runoff coefficient on ~~previous~~ conditions		Datei:Abhängigkeit_des_Abflussbeiwertes_von_der_Vorgeschichte_EN.png\|Dependence of the runoff coefficient on antecedent conditions
	Datei:Abhängigkeit_des_Abflussbeiwertes_von_der_kumulierten_Niederschlagssumme_EN.png\|Dependence of the runoff coefficient on the cumulative precipitation sum		Datei:Abhängigkeit_des_Abflussbeiwertes_von_der_kumulierten_Niederschlagssumme_EN.png\|Dependence of the runoff coefficient on the cumulative precipitation sum
	</gallery>		</gallery>

Froehlich am 25. November 2020 um 14:57 Uhr

2020-11-25T14:57:41Z

← Nächstältere Version		Version vom 25. November 2020, 16:57 Uhr
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	Using a CN value that is dependent on the soil type and land use (see /DVWK, 1991/), the initial losses and a relationship between the runoff coefficient and the accumulated rainfall amount up to the current point in time can be derived, both of which are dependent on antecedent conditions /Zaiss, 1987/. With this approach, the runoff coefficient increases with increasing precipitation amount during the course of the rainfall event.		Using a CN value that is dependent on the soil type and land use (see /DVWK, 1991/), the initial losses and a relationship between the runoff coefficient and the accumulated rainfall amount up to the current point in time can be derived, both of which are dependent on antecedent conditions /Zaiss, 1987/. With this approach, the runoff coefficient increases with increasing precipitation amount during the course of the rainfall event.
	The quantification of the ~~previous~~ conditions is based on the 21-day-precipitation index <math>VN</math>.		The quantification of the antecedent conditions is based on the 21-day-precipitation index <math>VN</math>.

	<math>V_N=\sum_{j=1}^21 C(j)^j \cdot hN_j</math>		<math>V_N=\sum_{j=1}^21 C(j)^j \cdot hN_j</math>

Froehlich am 25. November 2020 um 14:57 Uhr

2020-11-25T14:57:22Z

← Nächstältere Version		Version vom 25. November 2020, 16:57 Uhr
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	====Event-specific discharge coefficient based on the Soil-Conservation-Service (SCS) method====		====Event-specific discharge coefficient based on the Soil-Conservation-Service (SCS) method====

	Using a CN value that is dependent on the soil type and land use (see /DVWK, 1991/), the initial losses and a relationship between the runoff coefficient and the accumulated rainfall amount up to the current point in time can be derived, both of which are dependent on ~~previous~~ conditions /Zaiss, 1987/. With this approach, the runoff coefficient increases with increasing precipitation amount during the course of the rainfall event.		Using a CN value that is dependent on the soil type and land use (see /DVWK, 1991/), the initial losses and a relationship between the runoff coefficient and the accumulated rainfall amount up to the current point in time can be derived, both of which are dependent on antecedent conditions /Zaiss, 1987/. With this approach, the runoff coefficient increases with increasing precipitation amount during the course of the rainfall event.
	The quantification of the previous conditions is based on the 21-day-precipitation index <math>VN</math>.		The quantification of the previous conditions is based on the 21-day-precipitation index <math>VN</math>.

Froehlich am 25. November 2020 um 14:56 Uhr

2020-11-25T14:56:24Z

← Nächstältere Version		Version vom 25. November 2020, 16:56 Uhr
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	====Constant discharge coefficient Ψ====		====Constant discharge coefficient Ψ====

	If a <math>\Psi</math> value is given, the remaining part of the precipitation after covering the initial losses (wetting and depression losses) is converted to runoff by multplying with <math>\Psi</math>, independent of the ~~history~~ and the characteristics of the rainfall event (amount, intensity, duration). If possible, this approach should be avoided, since the process of runoff formation is greatly simplified.		If a <math>\Psi</math> value is given, the remaining part of the precipitation after covering the initial losses (wetting and depression losses) is converted to runoff by multplying with <math>\Psi</math>, independent of the antecedent conditions and the characteristics of the rainfall event (amount, intensity, duration). If possible, this approach should be avoided, since the process of runoff formation is greatly simplified.

Froehlich am 25. November 2020 um 13:53 Uhr

2020-11-25T13:53:47Z

← Nächstältere Version		Version vom 25. November 2020, 15:53 Uhr
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	==Runoff Concentration==		==Runoff Concentration==

	Runoff concentration determines the delay of ~~surface~~ runoff from the catchment area. A parallel storage cascade with three reservoirs for permeable and one cascade for impermeable areas is used. The outflow of the components interflow and baseflow is output at the element outlet after passing through a single linear storage.		Runoff concentration determines the delay of runoff from the catchment area. A parallel storage cascade with three reservoirs for permeable and one cascade for impermeable areas is used for surface runoff. The outflow of the components interflow and baseflow is output at the element outlet after passing through a single linear storage.
	[[Datei:Abflusskonzentration_EN.png\|frame\|none\|Calculation of the runoff concentration of catchment areas]]		[[Datei:Abflusskonzentration_EN.png\|frame\|none\|Calculation of the runoff concentration of catchment areas]]