Evaluation of a Simple Hydraulic Resistance Model Using Flow Measurements Collected in Vegetated Waterways
Evaluation of a Simple Hydraulic Resistance Model Using Flow Measurements Collected in Vegetated Waterways作者机构：Department of Earth System Analysis Faculty of Geosciences Utrecht University Utrecht The Netherlands Department of Water Engineering & Management Faculty of Engineering Technology University of Twente Enschede The Neth- erlands HKV Consultants Lelystad The Netherlands
出 版 物：《Open Journal of Modern Hydrology》 (现代水文学期刊（英文）)
年 卷 期：2013年第3卷第1期
页 面：28-37页
学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
主 题：Hydraulic Roughness Vegetation River Flow Floodplains ADCP Measurements
摘 要：A simple idealized model to describe the hydraulic resistance caused by vegetation is compared to results from flow experiments conducted in natural waterways. Two field case studies are considered: fixed-point flow measurements in a Green River (case 1) and vessel-borne flow measurements along a cross-section with floodplains in the river Rhine (case 2). Analysis of the two cases shows that the simple flow model is consistent with measured flow velocities and the present vegetation characteristics, and may be used to predict a realistic Manning resistance coefficient. From flow measurements in the river floodplain (case 2) an estimate was made of the equivalent height of the drag dominated vegetation layer, as based on measured flow characteristics. The resulting height corresponds well with the observed height of vegetation in the floodplain. The expected depth-dependency of the associated Manning resistance coefficient for could not be detected due to lack of data for relatively shallow flows. Furthermore, it was shown that topographical variations in the floodplain may have an important impact on the flow field, which should not be mistaken as roughness effects.
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