HECRas modeling / piers in an overbank
HECRas modeling / piers in an overbank
(OP)
Several rows of circular columns support a house above the base flood within the overbank of a large river. I have established cross-sections through each set of piers, and include natural sections just upstream and downstream of the piers. Each pier is modeled as an obstruction. My question is: should additional cross-sections be established between the rows of piers to account for open areas between the piers, or do the obstructions not project (extend) between cross-sections? If there is a reference that addresses this specifically that would be helpful.





RE: HECRas modeling / piers in an overbank
It seems like over-kill to have multiple cross-sections through one house. You could model the house as a bridge and the piers as actual piers. That way you can calculate your scour directly.
RE: HECRas modeling / piers in an overbank
RE: HECRas modeling / piers in an overbank
You should also read HEC-18 and HEC-20 to see how scour occurs at round piers and how the spacing between them affects the scour.