Fluvial Transport of Large Boulders  

作　　者：Robert E.Criss William E.Winston G.Robert Osburn 

机构地区：[1]Department of Earth,Environmental and Planetary Sciences,Washington University,St.Louis,Missouri,63130,USA

出　　处：《Journal of Earth Science》2024年第6期2045-2049,共5页地球科学学刊（英文版）

摘　　要：Fast water can cause extraordinary bedload transport.Of the record floods considered here,the Jul.26,2022 urban flash flood on the upper River des Peres,St.Louis,Missouri provides particularly well-constrained data on flow conditions associated with large block movement.Field measurements and a detailed lidar survey show that concrete slabs as large as 3.0×2.5×0.33 m^(3)were moved from the open channel to reside 215 to 450 m inside a 6.5 m-diameter drainage tunnel,some to become part of a 10-m long imbricated pile.Peak flows of 160 m^(3)/s were recorded at a gauging station located only 1.6 km upstream of the tunnel entrance,which provides a good estimate of 4.2 m/s for the peak flow velocity in the tunnel.Available observational data and a new theoretical analysis show that the radius of large boulders that can be moved by flowing water is directly proportional to the velocity head.

关 键 词：fluvial transport imbrication floods lidar survey BEDLOAD urban flash flood HYDROGEOLOGY 

分 类 号：P333[天文地球—水文科学] P641[水利工程—水文学及水资源]