Questions tagged [models]

A tag for questions about conceptual, analytical or numerical models used in Earth science disciplines.

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2 votes
1 answer
18 views

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)...
0 votes
1 answer
14 views

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 ...
0 votes
1 answer
21 views

MHYDRO Hydrodynamics (MIKE HYDRO)

I have run a MIKE HYDRO 1D simulation to completion without any errors being flagged. How do I check for any instability within the model or whether the simulated results are realistic?
2 votes
2 answers
27 views

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 ...
2 votes
1 answer
23 views

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 ...
0 votes
1 answer
26 views

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 ...
2 votes
1 answer
24 views

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 ...
1 vote
1 answer
78 views

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 ...
1 vote
0 answers
32 views

Map showing the change in precipitation intensity

Hi I need a map for the North American region that shows the change in rainfall intensity. Unfortunately, I can only find maps like this map Unfortunately, these are not detailed to use.
1 vote
0 answers
5 views

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 ...
0 votes
0 answers
9 views

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 ...
1 vote
0 answers
18 views

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 ...
2 votes
1 answer
41 views

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 ...
1 vote
1 answer
15 views

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 ...
2 votes
1 answer
13 views

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 ...
1 vote
1 answer
16 views

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 ...
0 votes
0 answers
14 views

Catchment-scale water balance in ACRU4

What is the catchment-scale water balance in the modelling tool ACRU4? I have set up a model with one subcatchment and five HRUs representing agricultural fields and grasslands with different soils ...
2 votes
0 answers
20 views

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 ...
2 votes
0 answers
26 views

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 ...
1 vote
1 answer
66 views

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: ...
9 votes
1 answer
394 views

What is the difference between the freezing level and 0 C isotherm in NOAA's GFS?

I'm playing around with NOAA's GFS forecast data and I see that it contains both a "0 °C isotherm level" and a "Highest tropospheric freezing level". Could someone tell me the ...
1 vote
1 answer
70 views

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 ...
4 votes
1 answer
255 views

World Elevation Data as CSV

Hi I need For each Lat and Long value also the Alt value! However, I am having problems extracting these values from a Geotiff and wonder if this data is publicly available in Excel or CSV file format?...
0 votes
0 answers
15 views

Run Hydrus-1D on Linux

I want to run Hydrus-1D on Linux, and I wonder if anyone knows about this to help me. I could compile the source code on Linux but it is not working. I really appreciate any help regarding this. ...
0 votes
0 answers
146 views

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 ...
1 vote
0 answers
40 views

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 ...
4 votes
1 answer
120 views

A problem of the 2-Layer hydrostatic model

The 2-layer hydrostatic model is like this And the pressure of the two layers and the top are and it is easy to find the horizontal gradient of $p_1$ and $p_2$ \begin{equation} \begin{aligned} \nabla ...
2 votes
1 answer
51 views

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 ...
5 votes
1 answer
84 views

What regions of the US will have *improved* climate given current predictions of climate change?

This is really a two part question: 1) Is there a good model for mapping climate conditions in a particular location to pleasantness or livability or something like that? 2) If there is such a model,...
1 vote
0 answers
27 views

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 ...
2 votes
1 answer
30 views

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 votes
1 answer
180 views

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. ...
4 votes
1 answer
2k views

Moisture flux convergence in GrADS

I want to calculate vertically integrated moisture flux convergence (VIMFC) in GrADS. But when I give the following instruction it marks me errors: ...
1 vote
1 answer
53 views

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 ...
15 votes
1 answer
262 views

How to compute the earthquake occurrence probability under ETAS model

I have fitted an ETAS model (unmarked) with an independent exponential magnitude distribution to a set of earthquake data. However, I do not know how to calculate the probability of the earthquake ...
8 votes
1 answer
282 views

Do 360 day calendars affect climate models?

I was recently reading Zach Holman's blogpost on time and remembering that I've had to work with CMIP5 output that used a 360 day calendar, rather than a 365 day or a Greogrian (or Proleptic Gregorian)...
2 votes
3 answers
64 views

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 ...
1 vote
0 answers
38 views

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 ...
1 vote
0 answers
36 views

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 ...
4 votes
2 answers
3k views

What does the degree and order of Spherical Harmonics mean?

I've been reading up about Gravitational Models and Spherical Harmonics. Where I first read about them is in this scholarly article on Autonomous navigation with Gravity Gradients. It talks about ...
4 votes
0 answers
63 views

Understanding 1x5x9 pattern for block precedence algorithm in open pit mining

I came across several visual representation of the 1x5x9 pattern defined for block precedence computation in the ultimate pit limit problem. But I can't seem to understand fully how it is computed. I ...
10 votes
0 answers
283 views

What is the smallest grid spacing that Eulerian air quality models should use?

The University of Washington runs the Advanced Research Weather Research & Forecasting (WRF) model in predictive mode, and then tests the skill of the model anywhere from 12 - 84 hours out from ...
7 votes
1 answer
137 views

Why is it that "With higher CO2, the dry gets drier and the wet gets wetter"?

The Phys.org article CO2 dip may have helped dinosaurs walk from South America to Greenland quotes Dennis Kent, "adjunct research scientist at Columbia University's Lamont-Doherty Earth ...
1 vote
1 answer
40 views

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?
10 votes
1 answer
252 views

How quickly is the Earth shrinking?

Except for ice, acetic acid, bismuth and gallium and a few other things materials generally shrink when they cool and solidify, so I'm pretty sure Earth has as well. It probably wouldn't be ...
2 votes
2 answers
95 views

Would ultrasound be a valid method of mapping ocean floors given the perceived "gel" is ocean water?

I am a scuba diver, with a big idea that would require me to map various dive sites as I went to them and dove in them. The typical size and other implications of sonar technology would essentially ...
0 votes
1 answer
88 views

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" "...
-3 votes
1 answer
285 views

Where can I find a shallow-water solver in MATLAB?

I do not know how to solve the shallow water equations in the matrix form in MATLAB. I didn't find anything useful on the internet. I have the specific mathematical equations to solve (please see the ...
0 votes
1 answer
71 views

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.
4 votes
0 answers
52 views

How would you predict the future climate with only 7 years of interest?

In my specific case, I have worked with a data set from 2001 to 2018 which had to be split up in 2012 due to major updates in the data. Therefore, I am now dealing with a data set of 12 years (2001 to ...

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