DataAltiExtrapolation_Valery {airGR} | R Documentation |

## Altitudinal extrapolation of precipitation and temperature series described by A. Valery

### Description

Function which extrapolates the precipitation and air temperature series for different elevation layers (method from Valéry, 2010).

### Usage

```
DataAltiExtrapolation_Valery(DatesR, Precip, PrecipScale = TRUE,
TempMean, TempMin = NULL, TempMax = NULL,
ZInputs, HypsoData, NLayers, verbose = TRUE)
```

### Arguments

`DatesR` |
[POSIXt] vector of dates |

`Precip` |
[numeric] time series of daily total precipitation (catchment average) [mm/time step] |

`PrecipScale` |
(optional) [boolean] indicating if the mean of the precipitation interpolated on the elevation layers must be kept or not, required to create CemaNeige module inputs, default = |

`TempMean` |
[numeric] time series of daily mean air temperature [°C] |

`TempMin` |
(optional) [numeric] time series of daily min air temperature [°C] |

`TempMax` |
(optional) [numeric] time series of daily max air temperature [°C] |

`ZInputs` |
[numeric] real giving the mean elevation of the Precip and Temp series (before extrapolation) [m] |

`HypsoData` |
[numeric] vector of 101 reals: min, q01 to q99 and max of catchment elevation distribution [m] |

`NLayers` |
[numeric] integer giving the number of elevation layers requested [-] |

`verbose` |
(optional) [boolean] boolean indicating if the function is run in verbose mode or not, default = |

### Details

Elevation layers of equal surface are created the 101 elevation quantiles (`HypsoData`

)
and the number requested elevation layers (`NLayers`

).

Forcing data (precipitation and air temperature) are extrapolated using gradients from Valery (2010).
(e.g. gradP = 0.0004 [m-1] for France and gradT = 0.434 [°C/100m] for January, 1st).

This function is used by the `CreateInputsModel`

function.

### Value

list containing the extrapolated series of precip. and air temp. on each elevation layer

$LayerPrecip | [list] list of time series of daily precipitation (layer average) [mm/time step] |

$LayerTempMean | [list] list of time series of daily mean air temperature (layer average) [°C] |

$LayerTempMin | [list] list of time series of daily min air temperature (layer average) [°C] |

$LayerTempMax | [list] list of time series of daily max air temperature (layer average) [°C] |

$LayerFracSolidPrecip | [list] list of time series of daily solid precip. fract. (layer average) [-] |

$ZLayers | [numeric] vector of median elevation for each layer |

### Author(s)

Laurent Coron, Audrey Valéry, Olivier Delaigue, Pierre Brigode, Guillaume Thirel

### References

Turcotte, R., Fortin, L.-G., Fortin, V., Fortin, J.-P. and Villeneuve, J.-P. (2007).
Operational analysis of the spatial distribution and the temporal evolution of the snowpack water equivalent in southern Quebec, Canada.
Nordic Hydrology, 38(3), 211, doi:10.2166/nh.2007.009.

Valéry, A. (2010),
Modélisation précipitations-débit sous influence nivale ? : Elaboration d'un module neige et évaluation sur 380 bassins versants.
PhD thesis (in French), AgroParisTech - Cemagref Antony, Paris, France.

USACE (1956),
Snow Hydrology, pp. 437.
U.S. Army Coprs of Engineers (USACE) North Pacific Division, Portland, Oregon, USA.

### See Also

`CreateInputsModel`

, `RunModel_CemaNeigeGR4J`

*airGR*version 1.7.6 Index]