Questions tagged [models]

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

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1 vote
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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.
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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 ...
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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 ...
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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 ...
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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
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?
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
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 ...
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
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 ...
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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 ...
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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 ...
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 ...
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 ...
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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 ...
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 ...
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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: ...
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 ...
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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?...
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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 ...
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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 ...
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 ...
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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 ...
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 ...
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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. ...
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 ...
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 ...
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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 ...
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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 ...
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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 ...
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 ...
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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" "...
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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.
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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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2 votes
1 answer
39 views

Free forecast vs cycled model runs

What is the difference between a free forecast and a cycled model run? This GFS wiki mentions both, but does not define them.
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3 votes
0 answers
62 views

Looking for the climate classification for a particular climate

I'm looking for the climate classification among the many different climate classification systems covering my absolute favorite form of climate. If a classification for this doesn't exist, and you ...
5 votes
1 answer
217 views

How/where is randomness/stochasticity used in weather prediction

I am seeking information on how weather models use randomness (if at all). From what I can gather daily weather forecasting uses partial differential equations with initial and boundary conditions ...
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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?
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1 vote
0 answers
17 views

Does anyone know of any studies comparing juvenile and adult abundance data for an ontogenetic reef fish? [closed]

I'm trying to look into relationships between juvenile Hogfish which recruit in sea grass habitats to adult abundance data that move to deeper offshore reef and hard bottom habitat. I have data from ...
5 votes
0 answers
80 views

How do you choose appropriate parameters for a lowpass filter when filtering a Bouguer anomaly?

I am trying to filter my Bouguer anomaly data to remove the short wavelength features. I have created a lowpass filter to achieve this, but I am wondering how I can more objectively choose my cutoff ...
4 votes
1 answer
264 views

Do trees capture more CO2 during a fast growth stage?

I understand that trees capture CO2 from the air and use that carbon to grow. As trees reach mature height, do they begin to capture less CO2 as they would only need carbon for "maintenance" as ...
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2 votes
1 answer
57 views

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 ...
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2 votes
2 answers
179 views

What is the simplest meteorological model to operate?

For teaching purposes I am looking for an atmospheric model that can be easily installed and the input data can be easily read and prepared. Preferably I would like to run a global low resolution ...
3 votes
0 answers
38 views

How to transfer surface roughness from the unit mm into Strickler coefficient m1/3 per second

I have a hydrodynamic model to simulate flash floods. This model expects roughness data in the Strickler coefficient format (kst) in the unit m1/3 per second. I got a table with roughness values I'm ...
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