Scour prevention in bottomless arch culverts  

作　　者：B.M.CROOKSTON B.P.TULLIS 

机构地区：[1]Utah Water Research Laboratory,Utah State University,8200 Old Main Hill,Logan,UT 84322 [2]Utah State University,Utah Water Research Laboratory,8200 Old Main Hill,Logan,UT 84322

出　　处：《International Journal of Sediment Research》2012年第2期213-225,共13页国际泥沙研究（英文版）

基　　金：Funding for this study was provided by the Alaskan Department of Transportation and Public Facilities and the State of Utah(Utah Water Research Laboratory)

摘　　要：Bottomless arch culverts are employed as ecological bridges at road crossings with their most common application being fish passage. The simulated culvert streambed should mimic the existing natural channel but be engineered to resist erosion during high flow events. To provide some design guidance for simulated streambed stability in culverts, a culvert streambed stability study was conducted using a 0.61-m （2-ft） diameter smooth-walled bottomless arch culvert featuring streambed materials ranging in size from pea gravel to cobbles. Several culvert entrance geometries over a range of headwater depths （unsubmerged and submerged inlets conditions） were evaluated. Eight riprap stone-sizing stability relationships were evaluated, relative to the experimental data, to determine their potential applicability to arched bottomless culverts streambed stability design. Some general observations are discussed regarding the location and extent of scour events in bottomless culverts and incipient motion velocity variations between the bottomless arched culvert and a rectangular flume for the same substrate materials.Bottomless arch culverts are employed as ecological bridges at road crossings with their most common application being fish passage. The simulated culvert streambed should mimic the existing natural channel but be engineered to resist erosion during high flow events. To provide some design guidance for simulated streambed stability in culverts, a culvert streambed stability study was conducted using a 0.61-m （2-ft） diameter smooth-walled bottomless arch culvert featuring streambed materials ranging in size from pea gravel to cobbles. Several culvert entrance geometries over a range of headwater depths （unsubmerged and submerged inlets conditions） were evaluated. Eight riprap stone-sizing stability relationships were evaluated, relative to the experimental data, to determine their potential applicability to arched bottomless culverts streambed stability design. Some general observations are discussed regarding the location and extent of scour events in bottomless culverts and incipient motion velocity variations between the bottomless arched culvert and a rectangular flume for the same substrate materials.

关 键 词：Scour prevention Bottomless arch culvert Fish passage RIPRAP Gravel streambed 

分 类 号：U449[建筑科学—桥梁与隧道工程]