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texperiment with different parameter values for erosion/deposition - granular-c… |
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git clone git://src.adamsgaard.dk/granular-channel-hydro |
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--- |
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commit 464ba42ad1e569c9c86c0b29e272ad9555b32feb |
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parent 400da52ca6dea9a381f902ba653ca1c267ac286f |
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Author: Anders Damsgaard Christensen <[email protected]> |
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Date: Thu, 2 Feb 2017 16:46:46 -0800 |
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experiment with different parameter values for erosion/deposition |
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Diffstat: |
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M 1d-channel.py | 21 ++++++++++++--------- |
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1 file changed, 12 insertions(+), 9 deletions(-) |
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--- |
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diff --git a/1d-channel.py b/1d-channel.py |
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t@@ -23,7 +23,7 @@ import sys |
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# # Model parameters |
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Ns = 25 # Number of nodes [-] |
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Ls = 100e3 # Model length [m] |
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-t_end = 24.*60.*60.*2 # Total simulation time [s] |
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+t_end = 24.*60.*60.*365 # Total simulation time [s] |
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tol_Q = 1e-3 # Tolerance criteria for the normalized max. residual for Q |
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tol_P_c = 1e-3 # Tolerance criteria for the normalized max residual for P_c |
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max_iter = 1e2*Ns # Maximum number of solver iterations before failure |
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t@@ -44,8 +44,9 @@ m_dot = 4.5e-7 |
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# Walder and Fowler 1994 sediment transport parameters |
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K_e = 0.1 # Erosion constant [-], disabled when 0.0 |
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-K_d = 6.0 # Deposition constant [-], disabled when 0.0 |
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-alpha = 2e5 # Geometric correction factor (Carter et al 2017) |
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+# K_d = 6.0 # Deposition constant [-], disabled when 0.0 |
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+K_d = 0.1 # Deposition constant [-], disabled when 0.0 |
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+alpha = 1e5 # Geometric correction factor (Carter et al 2017) |
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# D50 = 1e-3 # Median grain size [m] |
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# tau_c = 0.5*g*(rho_s - rho_i)*D50 # Critical shear stress for transport |
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d15 = 1e-3 # Characteristic grain size [m] |
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t@@ -85,7 +86,7 @@ hydro_pot = rho_w*g*b + p_w # Initial guess of hydraulic po… |
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# Initialize arrays for channel segments between nodes |
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S = numpy.ones(len(s) - 1)*S_min # Cross-sect. area of channel segments[m^2] |
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S_max = numpy.zeros_like(S) # Max. channel size [m^2] |
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-dSdt = numpy.empty_like(S) # Transient in channel cross-sect. area [m^2/s] |
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+dSdt = numpy.zeros_like(S) # Transient in channel cross-sect. area [m^2/s] |
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W = S/numpy.tan(numpy.deg2rad(theta)) # Assuming no channel floor wedge |
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Q = numpy.zeros_like(S) # Water flux in channel segments [m^3/s] |
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Q_s = numpy.zeros_like(S) # Sediment flux in channel segments [m^3/s] |
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t@@ -124,9 +125,10 @@ def channel_shear_stress(Q, S): |
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def channel_erosion_rate(tau): |
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# Parker 1979, Walder and Fowler 1994 |
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- # return K_e*v_s*(tau - tau_c).clip(min=0.)/(g*(rho_s - rho_w)*d15) |
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+ # return K_e*v_s*(tau - tau_c).clip(min=0.)/(g*(rho_s - rho_w)*d15)**(3./2) |
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# Carter et al 2017 |
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- return K_e*v_s/alpha*(tau - tau_c).clip(min=0.)/(g*(rho_s - rho_w)*d15) |
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+ return K_e*v_s/alpha*(tau - tau_c).clip(min=0.) / \ |
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+ (g*(rho_s - rho_w)*d15)**(3./2.) |
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def channel_deposition_rate_kernel(tau, c_bar, ix): |
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t@@ -200,6 +202,7 @@ def update_channel_size_with_limit(S, dSdt, dt, N): |
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# Damsgaard et al, in prep |
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S_max = ((c_1*N.clip(min=0.)/1000. + c_2) * |
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numpy.tan(numpy.deg2rad(theta))).clip(min=S_min) |
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+ S_max[:] = 1000. |
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S = numpy.minimum(S + dSdt*dt, S_max).clip(min=S_min) |
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W = S/numpy.tan(numpy.deg2rad(theta)) # Assume no channel floor wedge |
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return S, W, S_max |
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t@@ -391,11 +394,11 @@ while time <= t_end: |
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# Find new effective pressure in channel segments |
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N_c = rho_i*g*H_c - P_c |
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- plot_state(step, time) |
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+ if step % 10 == 0: |
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+ plot_state(step, time) |
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# import ipdb; ipdb.set_trace() |
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- #if step > 0: |
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- #break |
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+ # if step > 0: break |
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# Update time |
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time += dt |
