General Questions in Raven

[ephilip]

Hi James,
For time series of Observed flow data (page 128), if HYDROGRAPH is used as the data_type then you can only use basin_ID. You cannot link HRU_ID (more than one gauge in one subbasin) and HYDROGRAPH. Am I correct?

Thank you
Elizabeth

[rchlumsk]

Hi Elizabeth

That is correct, the observed hydrograph must be linked to a subbasin outlet, not an HRU. The HRUs are conceptualized within the subbasin and are not necessarily contiguous in space, therefore it would not make sense to compare outflows from HRUs.

[ephilip]

Greetings,
In the user manual (page17) you talk about GAWSER-style snow balance and consolidation routine added in v 2.7. But in the technical section there is no information. Only GAWSER percolation (page 35). Would you please clarify.
Elizabeth

[Konhee Lee]

Hello Elizabeth,

The GAWSER-style snow balance was an attempt to emulate the SNOMLT process described in
acwc.sdp.sirsi.net/client/en_US/search/asset/1001420;jsessionid=22BBBEC081240AB73639002B9F4AE46B.enterprise-15000


Unfortunately, we did not have access to the source code and data, so we were not able to emulate it exactly the same.
We had matching snow water equivalent (SWC) and liquid water content (LWC), but our depth was off by 1 cm compared to the example in the documentation (pg 26).

An example rvi file to use the process can be something like:

#########################################################################
:FileType rvi ASCII Raven 2.5
:WrittenBy Konhee Lee
:CreationDate Nov 2016
# Simple snowmelt model to test GAWSER
#------------------------------------------------------------------------
:RunName run1
:StartDate 2000-01-01 00:00:00
:Duration 21
:Timestep 1
:Method ORDERED_SERIES
:Routing ROUTE_NONE
:SoilModel SOIL_ONE_LAYER
:RainSnowFraction RAINSNOW_DATA

#------------------------------------------------------------------------
#
:HydrologicProcesses
:Precipitation PRECIP_RAVEN ATMOS_PRECIP MULTIPLE
:SnowBalance SNOBAL_GAWSER MULTIPLE MULTIPLE
:Flush RAVEN_DEFAULT PONDED_WATER SURFACE_WATER
:EndHydrologicProcesses
#------------------------------------------------------------------------

#---------------------------------------------------------
# Output Options
#
:WriteForcingFunctions
:DebugMode yes

Let me know if you have any questions.

Regards,
Konhee

[ephilip]

Greetings,
Would you please explain following commands. It is bit confusing.
1. :RainSnowFraction
2. :RainSnowPartitioning
3. :RainSnowTransition

Thank you
Elizabeth

[rchlumsk]

Hi Elizabeth

1. RainSnowFraction is the method by which rain and snow is partitioned or fractionated. There is generally some range of temperatures/conditions where there is a mix of rain and snow that falls, and the method provided in this argument determines the partitioning of general precipitation amounts into specific amounts of rain and snow. The methods for this command currently deployed are listed on page 102 of the manual (Table A.1).

2. RainSnowPartitioning is mentioned once in the manual as far as I can see in section 6.3.1, I believe this is a typo and should say :RainSnowFraction. In the model templates and files the method is supplied with the :RainSnowFraction command.

3. The RainSnowTransition command provides the transition temperatures for partitioning rain and snow, which is used by some methods. The RainSnow temperatures are provided as the midpoint of this range and the total range in degrees Celsius (page 188 of manual).

Hope that helps!
Rob

[ephilip]

Good Morning,

Why temp_monthly_min [C] and temp_monthly_max [C] value in the ForcingFunctions.csv file coming as -33333.3?

Thank you
Elizabeth

[Konhee Lee]

Hello,

It looks like monthly temperatures aren't supported for gridded data yet.
Dr.Craig, please let us know if this is not the case.

Regards,
Konhee

[ephilip]

Good Morning
In Figure 1.1: Land surface partitioning in Raven, the part (b) shows Grid cell/LSM Discretization. Is it just for reference? Raven is HRU based as in (a).

Thank you
Elizabeth

[rchlumsk]

Hi Elizabeth

Raven can emulate grid cell-type discretization if you setup each subbasin with one HRU, and set the coordinates of each in a grid layout. You would also likely create forcings for each grid cell explicitly, although that is not required by any means.

Cheers,
Rob