Doctoral Dissertation Research in Geography and Regional Science

基本水力学变量，如排水量和水流剪切 应力，是从速度分布，假设他们的形状是 对数的 最近的研究表明， 在粗层状河流中，通常不是对数的，而是分段的， S形 这篇博士论文的研究将集中在 影响流速形状和空间变化的各种因素 天然河流中粗床物质的剖面。 在这个项目中 将收集两组速度剖面数据：一组 从纽约的10个天然粗层状溪流中测量， 魁北克和另一组从水槽与床的粗材料， 位于纽约的州立大学水力学实验室， 布法罗。 这两组测量结果将分别允许 说明不同河床粗糙度对河床形状和 速度剖面的空间变化和 难以分离的变量（如渠道坡度）的影响 在外地 这两套互补的现场和实验室 数据将使更准确地估计水 流量、床沙夹带和床沙输移率。 这项研究将有助于更好地理解流动 以及具有大粗糙度元件的通道中的阻力。 的 解决了地貌学、工程学和 地表水开发中遇到的环境科学 资源依赖于开发更准确的洪水演算模型， 泥沙输移模型 该项目还将提供一个优秀的 一个有前途的年轻学者继续发展的机会 独立研究能力。

Basic hydraulic variables, such as water discharge and flow shear stress, are derived from velocity profiles assuming that their shape is logarithmic. Recent studies have demonstrated that velocity profiles in coarse bedded streams are often not logarithmic but segmented or S-shaped. This doctoral dissertation research will focus on the various factors affecting the shape and spatial variation of velocity profiles in natural streams with coarse bed material. In this project two sets of data will be collected on velocity profiles: one set of measurements from 10 natural coarse bedded streams in New York and Quebec and the other set from a flume with a bed of coarse material in the Hydraulics Laboratory at the State University of New York at Buffalo. Respectively, these two sets of measurements will permit the elucidation of the effect of varying bed roughness on the shape and spatial variation of velocity profiles and the examination of the effect of variables such as channel slope that are difficult to isolate in the field. These two complementary sets of field and laboratory data will make possible the more accurate estimation of water discharge, bed sediment entrainment, and bed sediment transport rates. This research will contribute to a better understanding of flow and resistance in channels with large roughness elements. The solutions to many problems in geomorphology, engineering, and environmental science encountered in the exploitation of surface water resources depend upon developing more accurate flood routing models and sediment transport models. The project also will provide an excellent opportunity for a promising young scholar to continue to develop independent research skills.