Questions tagged [models]
A tag for questions about conceptual, analytical or numerical models used in Earth science disciplines.
219
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How to estimate the runoff time for my area?
I want to use an rainfall-runoff model for pluvial flash floods and need to choose for my synthetic rain event the appropriate duration. In the literature it often says that the chosen duration should ...
- 341
2
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1
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308
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How can I create multi model ensemble from output of 3 CMIP5 models?
I have a output of 3 models of CMIP5, they are CCSM4, IPSL and MPI. I have two scenarios RCP 2.6 and RCP 8.5 for each model. I want to know that how can I create a multi model ensemble from these 3 ...
- 123
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2k
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How to set up a domain from namelist in WRF?
I'm fairly inexperienced with WRF and was wondering if anyone could point me in the direction of any helpful resources for it.
The task I have is to make a simple 9 km domain, but I'm having trouble ...
- 21
2
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1
answer
26
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ACRU4 model run error: climate file -> "Error running display and data rules"
ACRU model was running fine and producing output.
After a few runs and parameter changes, the model returns this error message
Not sure what went wrong or changed.
Does anyone know what this means or ...
- 101
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1
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22
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Irrigating from multiple reservoirs in SWAT+
I am applying SWAT+ in an area with multiple reservoirs used for irrigation. I also have a lot of HRUs representing the various crop types in the catchment. The problem is that SWAT+ assigns one ...
- 41
2
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1
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44
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MIKE-SHE hydrological model: How to export SZ flow from a larger model to import into a smaller, nested model to inform SZ boundary conditions
We are working on a MIKE-SHE coupled MIKE-Hydro model for a small wetland in South Africa. One of the major issues is that it has zero-flux boundaries around the model domain in the saturated zone (SZ)...
- 81
2
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1
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46
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Negligible dam capacity to exclude from a runoff module
I am running the WRSM-Pitman model for the upper reaches of a quaternary catchment (which is smaller than its intended use for full quaternary catchments or larger areas). The total catchment area is ...
- 81
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32
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Distribution of wetland inflows to the wetland storage in WRSM-Pitman
I’m working with the comprehensive wetland module in WRSM-Pitman (Bailey and Pitman, 2015) and reconstructing the water balance.
Apart from parameter differences, which proportion of upstream inflows ...
- 101
2
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1
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149
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MIKE-SHE and MIKE-HydroRiver model run error: “Unable to write dynamic item” - drive space issues?
I am trying to run a coupled hydrology-hydraulic, MIKE-SHE - MIKE-HydroRiver (MIKE 1D) model (2020 version, DHI). To get the MIKE 1D hydraulic simulation to run without stability issues I had to use a ...
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2
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2
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375
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MIKE-SHE and MIKE-HydroRiver model run error “Water level exceeded maximum…more the 4.0000 times cross section height”
I am trying to run a coupled MIKE-SHE - MIKE-HydroRiver (MIKE 1D) model (2020 version) on a daily timestep. The model gets through the preprocessing stage without a problem but then shows an error ...
- 81
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45
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ACRU4 riparian zone receiving flood water from river channel
I would like to include wetlands and riparian zones as hydrological response units (HRUs) within the agricultural catchment research unit (ACRU4) model. In the ACRU4 user manual there are graphical ...
2
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1
answer
525
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Where can I find archived NAM/HRRR model runs?
I am looking for archived model runs for high-resolution North American weather models, i.e. NAM and HRRR stretching back 10+ years. Do these exist on the internet? Failing that, what's the next best ...
- 895
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123
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What to do with a gas sensor's values that fall outside of a model's range?
I'm using a few gas sensors (MQ2, MQ3, MQ4, MQ5, MQ6, MQ7, MQ8, MQ9, and MQ135) to measure the air quality inside my home. These sensors have been calibrated to work within a specific concentration ...
2
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1
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53
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Can historical emissions data be used for a future WRF-Chem model run?
I am new to running the WRF-Chem model, so this question maybe a little elementary. I wanted to perform an year-long simulation of certain chemical species for 2019 and for that, is it sufficient to ...
2
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1
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448
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Is spin-up really required to run the WRF-Chem model and if so, what determines the time period of the spin-up?
For example, I am interested in making a simulation for some chemical species for 2019. I am planning to provide NCEP/GDAS FNL meteorological data at 0.25 degree and CAM-Chem chemical boundary layer. ...
2
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3
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68
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What methods/apparatus are used to model the early Earth? What do we know of their accuracy?
A friend of mine asked our teacher but the class was over and in online mode, I can't ask my teacher until the next lecture. It sparked my curiosity, I know we use carbon dating for finding the age of ...
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0
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21
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Seeking guidance on predicting salinity of River network with incomplete data
So I am working with the USGS data on salinity of various River reaches in the United States and not every reach mapped has been tested. Is there an accepted model for inferring the salinity of ...
- 21
2
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1
answer
40
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WRSM-Pitman: Calculating alpha in the wetland surface area equation for estimating wetland evaporation
I am estimating the wetland water balance variables for the comprehensive wetland module.
For evaporation, it is calculated based on the net rainfall and average wetland storage area for the month. In ...
- 101
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0
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23
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What is the effect of increasing the size interval in the generalized dynamic equation (GDE) to simulate an evolving aerosol?
The following differential equation allows me to calculate the the number concentration of aerosol particles from 2 nm to 3 nm.
$$\frac{dN_2{_-{_3}}}{dt}=J_2-J_3-N_2{_-{_3}}.CoagS_2{_-{_3}}$$
In the ...
- 21
2
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0
answers
28
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Velocity boundary conditions from water depth time series
Currently, I am setting up a hydrodynamic model for a coastal zone. For this purpose I need to impose the velocity and water level at the open boundary.
Tidal models (e.g. TPXO) can give both velocity ...
- 133
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2
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244
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Why rely on climate models as opposed to paleoclimate data?
Something I hear often from climate scientists, and indeed even politicians, is that we "don't understand climate change very well". And, I'm sure this is true since the climate is a complex adaptive ...
- 143
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0
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76
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Inverse model problem
I have a dataset for river water, rain water and geology (main elements and trace elements). I want to apportion the contribution of geology to water chemistry using for that purpose a model. I was ...
- 401
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149
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Problem running the WAM wave model [closed]
In the WAM Cycle 4 wave model, why doesn't the model work for the year 1999?
When I tried to run for the year 1999 the model does not produce any results.
1
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1
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72
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Milancovich analysis
I would like to show the change in temperatures since 1960 until today. I have thought about creating two time blocks, e.g. from 1960-1970 and from 2010-2020! Then I want to average the data of these ...
- 1,989
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2
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88
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Is there a general equation to know how big of an area is affected by an earthquake?
If you visit USGS earthquakes listing, you get 3 points of information for each earthquake: Location, depth, magnitude. My question is, is there a way to approximate how big of an area is affected? ...
- 113
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974
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hydrologic vs. hydrodynamic modelling of surface runoff
In the description of a Software it says that it computes the net rainfall, runoff formation and runoffconcentration on a surface hydrologically. With an extra module, the runoff formation can also be ...
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1
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139
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How spatial resolution of a NWP model works?
I would like to know how the resolution of a Numerical Weather Prediction model conceptually works.
i.e.
"Global Forecast System's forecasts with 0.5° horizontal spatial resolution"
"...
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94
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Is COMSOL Multiphysics good for subduction CFD modelling? Are there alternatives?
As a beginner for CFD modelling of plate subduction, I heard comsol to be a good software. Can anybody suggests alternatives and the demerits of using COMSOL Multiphysics? Thank you.
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43
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How can I specifiy a substance in AERMOD?
Since I use OTHER as a pollutant ID, are there some parameters I could specify in order to get better results for dispersion of substance I am trying to model? eg. molecular weight or density?
- 11
1
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1
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120
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When GCMs are calibrated do they use 'corrected rainfall' input?
Part of calibrating Global Climatic Models involves 'hindcasts' or 'history matching' against historic climate records, including rainfall. Such rainfall records are all in error because almost all ...
- 14.3k
1
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1
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17
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ACRU4 PercentRiparianInfestation
One of the routines that I am interested in exploring further is the option of including a riparian zone within the Agricultural Catchments Research Unit (ACRU4) model. Once I add the riparian zone to ...
1
vote
1
answer
77
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MIKE-SHE model run error: “UZ column shorter than the initial water depth”
I am trying to run a catchment model using MIKE-SHE (2020 version, DHI) including an unsaturated zone (UZ) and a saturated zone (SZ) in the set-up. I have specified the ‘Finite Difference’ method for ...
- 81
1
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1
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254
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Cannot initialize MIKE-1D - Failed when solving for a steady state solution; water level being exceeded; Warning: Hyperthreading
I get the following error messages when running the hydrological model MIKE-SHE:
"Cannot initialize MIKE-1D - Failed when solving for a steady state solution; water level being exceeded; Warning: ...
- 81
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1
answer
55
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Can we know if a numerical model will converge or not according to the boundary conditions?
Consider a square 2D domain and a steady-state simulation. According to the geology of the domain, the North, South, West and East limits must be conditions of zero flow (Neumann). The aquifer ...
- 145
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1
answer
59
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research question for modelling extreme rainfall event with coupled 2D surface and 1D sewersystem model
I would like to write my thesis on modelling extreme rainfall events in urban areas coupling a 2D surface model with an 1D sewer channel model. I have access to a good software which models ...
- 25
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1
answer
1k
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How to de-stagger (or unstagger) WRF wind fields?
I am trying to calculate wind speed from the U and V wind components of a Weather Research and Forecasting (WRF) simulation. However, I came to realize that some ...
- 111
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1
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23
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Modelling extreme rainfall events: 'blanket approches' when considering soil infiltration
For my thesis on modelling an extreme rainfall event with a 2D surface runoff model I'm supposed to consider the effect of soil infiltration on the runoff: In my work description it says I'm supposed ...
- 341
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1
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80
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Can living where magnets are abundant provide a mini-magnetoshere?
Are there a mini-magnetosphere within the magnetosphere similar to mini-magnetosphere found on the Moon? Is there a map of these areas that would resemble the white swirls in the picture below?
The ...
- 1
1
vote
0
answers
15
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conserving mass while converting sigma levels to geopotential (z-levels)
I am using a sigma-level ocean model, so that I have dh (layer thicknesses), salinity and bathymetry (bottom depth) for some area (lon-lat box). Now, I would like to calculate the amount of salt at ...
- 111
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31
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Earthquake clustering by pairs algorithm questions
A program I'm writing does the following:
(EQ=earthquake, EV=event, ML=machinelearning, etc)
from a time series (in a selected station) it picks pairs of EQ' EVs with similar characteristics (...
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23
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Least equatorial ( and tidal) bulge consistent with modest amounts of water in polar regions
In World Building I asked a question about the climate of an hypothetical planet.
There Vogon poet said that
Everyone above 10° latitude will be in permanent drought
Considering that there were no ...
- 131
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1
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21
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ACRU4: rainfall units for the wetland water balance
Not sure about the rainfall units in the wetland water balance of ACRU.
I have looked at the ACRU4 user manual which comes with the modelling tool installation and a dissertation covering the wetland ...
- 101
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0
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22
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Developing or implementing manual/advanced irrigation in SWAT+
The following error about HRU occurred when I was trying to implement manual (advanced) irrigation operation.
An additional message advises that I contact developers directly when you want to create ...
- 41
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0
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18
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Updating plant/crop database
I have been trying to update the QSWAT+ crop database to include new crops. However it seems the model refuses to read a look-up table with new crops leaving me unable to represent all the various ...
- 41
1
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1
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23
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Mapping variables in the model to theory documentation in WRSM-Pitman
I’m working with the comprehensive wetland module in WRSM-Pitman. However, the variables listed in the wetland tab of the channel module are not referred to in the same way as the variables listed in ...
- 81
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0
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498
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How to plot quiver (current/wind arrows) plot on a basemap
and thank you for answering
I am trying to plot a quiver plot on a basemap (The basemap has to be a good quality map such as openstreetmap) and I can't find a way to do it.
There are some examples on ...
- 170
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50
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Complex interpolation for Isotopic data
I have another question, is there a package that interpolates precipitation data taking into account mountains and oceans? I have so far used Numpy and Basemap but as you can see in the code, the data ...
- 1,989
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0
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31
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Are there any online earth science formula/equation libraries?
I'm looking for a formula library like fxSolver but specifically for Earth science formulas. I could rummage through scientific papers like a nerd racoon, but first I want to make sure there isn't a ...
- 11
1
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0
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47
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Is there a more accurate method for estimating ground or soil temperatures
Context
We have geothermal, engineering and construction clients who often need accurate estimates of ground temperatures for project sites before they have physical access to the sites (for ...
- 111
1
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0
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58
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Using variables from different CMIP6 models
I would like to know if using variables (ex: sea surface temperature, precipitation, etc.) from two CMIP6 climate models to produce a species/niche distribution model is an accepted practice and won’t ...
- 11