Recent content by edge333

Hi all, I have a nonlinear equation of the form: \frac{TP_x}{TP_R} = c_0 + c_1 U_R^n + c_2 \frac{T_R^2}{\sqrt{U_R}} This equation describes the relationship between tidal parameters and river discharge (velocity) in tidal rivers derived from the 1-D St. Venant equations. TPx is some tidal...

This is the image zoomed in: The blue lines are initial contrast points that the segments grow from. The cyan points indicate a segment that was retained by the length and RMSE requirement The red points are the forward and backward pixels from the cyan point that were not chosen to be...

I'm doing some image processing of some tidal lines that I'm trying to digitize from photographs using Matlab. The digitization is heavily dependent on the indexing of the image of x-values (time) and y-values (water level). After some initial processing based on pixel contrast, line continuity...

I have some 3-D model output for a river system that is tidally forced at the entrance. Right now, I'm trying to perform some linear regression on the harmonic constants of various tidal constituents at for several locations along the river compared to the observed tidal data. A linear...

Homework Statement I have developed an equations for calculating some pollutant concentration as a function of x and y. I'm trying to simplify the problem so that I can write the equation for wp as a function of x. All variables except x and wp are known. Homework Equations...

Homework Statement I'm having some difficulty deriving the equation for a concentration of CO2 as a function of length and time. Ultimately I end up with an equation that includes the summation of two error function terms that appear to have incorrect signs. Given: A cylinder of...

Okay, I did that. And so I put the k term on line 48 and the error occurs on line 48. So it must be something with the k term. Why would it not do this if I set the spatial steps higher at dx = 200 m and dx = 2000 m instead of dx = 20 m?

Yeah, it said the error was on line 47 which is the second line of this equation (internal finite difference equation): conc (i, n + 1) = conc (i, n) - u * (dt / dx) * (conc (i, n) - conc (i - 1, n)) & + Dl * (dt / (dx**2)) * (conc (i + 1, n) - 2 * conc (i, n) + conc (i -...

Homework Statement Wrote a code using Fortran 95 to solve for an advection-dispersion equation but at the spatial steps specified at dx = 20 m over a total length, L of 20000 m, I keep getting an arithmetic overflow error. I have run this same program at smaller spatial intervals (dx =...

Thanks, I don't think that's it though. Here's a more simplified version of the code that doesn't involve solving for implicit methods that generate tridiagonal matrices. I think the problems are the same in terms of not getting the final spatial interval and time step. With this explicit scheme...

Homework Statement The problem statement is to use Fortran 95 to code a forward time, centered space numerical solution to the 1-D (x-direction) Advection-Dispersion Equation: dc/dt = u(dc/dx) + D(d2c/dx2) - kc where c is the concentration of contaminant, u is the advecting velocity, D is...

I realize that C1 can be defined multiple ways but the units are in W/k. I have a feeling he made a typo on the units though because the value for C1 works numerically for the following equation in order to determine the maximum temperature in part c.), however, the units don't make sense...

Yeah, that is the way some of my peers have done it (edit: tried to do it). However, the answer he gave us was 80.06 W/K which I can't figure out. Our my temperatures correct?

Homework Statement One dimensional system in vertical direction 2 meter high composting pile @ 65 \circC Top of pile has wind @ 40 \circC and h = 50 W/m2*K Bottom of pile at ground temperature of 20 \circC Only conductive heat transfer WITHIN pile; no convection Volumetric biochemical heat...