search

rogerlew / wepppy

Other
12 stars 7 forks source link

Manning's N default value #272

Closed rogerlew closed 5 months ago

rogerlew commented 5 months ago

image

Current defaults are 0.3 for total and 0.04 for bare image image

rogerlew commented 5 months ago

With 0.04 total and 0.03 for bare

Test Project: https://dev.wepp.cloud/weppcloud/runs/multilingual-driveway/disturbed9002/report/wepp/summary/

image image

rogerlew commented 5 months ago

peak flows original image

revised image

rogerlew commented 5 months ago

image image

bssheppard commented 5 months ago

Interface looks good! It is great to have a parameter input. I think the actual process being modeled in WEPP has an issue:

image

Why do the hydrographs start with so much flow? Seeing the difference in the burned and unburned makes me think it is how the water is routed, and not an initial condition.

It does not seem right that burned and unburned have the same time to peak, and the less 'flashy' shape of the burned hydrograph is suspicious.

bssheppard commented 5 months ago

image

Here are 2 burned single storm runs with a more reasonable rainfall than the example above. Neither Manning n case produced runoff in unburned conditions. (reasonable)

the timing and shape and increase in peak flow look correct!

I looked at the event rainfall, and it does not appear to be distributing the precipitation in time: image

the 31 mm at time =0 could be why the hydrograph is starting above zero I will do a fresh run to see if I get the same results, if so, I can add something else to the to do list.

rogerlew commented 5 months ago

Parameterization experiment from Garrett

image