Discharge-Stage Relationship on Urban Streams Evaluated at USGS Gauging Stations,St.Louis,Missouri  

作　　者：Robert E.Criss David L.Nelson 

机构地区：[1]Department of Earth and Planetary Sciences,Washington University,St.Louis MO 63130,USA [2]Columbia Cir,Pasadena CA 91105,USA

出　　处：《Journal of Earth Science》2020年第6期1133-1141,共9页地球科学学刊（英文版）

基　　金：the Jet Propulsion Laboratory,California Institute of Technology。

摘　　要：Extensive USGS data tables and detailed,1 m2 Li DAR surveys are used to determine the optimal power n that relates discharge(Q)to stage(h*)above channel bottom(ho)at 39 gauging stations on small streams in the St.Louis,Missouri area,all of which have catchments of 0.6 to 220 km2.Four different methodologies are employed to determine both n and ho:(1)optimizing linearity in a plot of Q1/n vs.local stage(hL)using USGS field measurements at each site;(2)optimizing linearity in a plot of Q1/n vs.hL using USGS rating tables at each site;(3)a mathematical inverse method applied to the same USGS rating tables;(4)use of Li DAR data on channel geometry to determine the power dependences of channel area A and hydraulic radius H on h*,combined with the Manning and rational equations to predict n.Of these methods,only methods 2 and 3 compare favorably,and these values compare poorly with Method 1 based on field data,and with method 4 based on theoretical and empirical relationships.Because Method 4 is predictive,it provides a useful alternative to methods 1–3 that are based on USGS field measurements,which are heavily weighted toward low discharges.We conclude that the apparent values of n in the USGS rating tables are systematically too low for small streams.

关 键 词：stream gauging Li DAR topography urban flooding DISCHARGE HYDROLOGY 

分 类 号：TU998.4[建筑科学—市政工程] P332[天文地球—水文科学]