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您的检索式：作者名="David L.Nelson"
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| 1 | Discharge-Stage Relationship on Urban Streams Evaluated at USGS Gauging Stations,St.Louis,Missouri显示文摘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. | Robert E.Criss David L.Nelson | 2020 | Journal of Earth Science2020，31，6： | 1 |
| 2 | Generation and Propagation of an Urban Flash Flood and Our Collective Responsibilities显示文摘0 INTRODUCTION Destructive flash flooding is a growing global problem,with dangers being particularly acute in densely populated urban areas. The intensity of rainfall events is increasing, creating high runoff rates that are further accelerated by high impervious cover, channelized streams, and storm sewers. | Robert E.Criss Eric M.Stein David L.Nelson | 2022 | Journal of Earth Science2022，33，6： | 0 |
| 3 | Turning the corner from observation to intervention in human genetics显示文摘In the early 1990s,shortly after we identified the genetic defect in FMR1 that results in fragile X syndrome(Verkerk et al.,1991),I attended a conference sponsored by the US National Fragile X Foundation.This biannual meeting mixes families and scientists in a very productive and enlightening way.One of the keynote talks was from a scientist who was generating viral vectors for use in gene therapy.This researcher suggested that gene replacement therapy for fragile X syndrome would soon be a reality given | David L.Nelson | 2018 | Journal of Genetics and Genomics2018，45，2： | 0 |
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