Experiment data is analyzed with method of projection pursuit for more reliability and utility value . this paper first systematically studied energy dissipater of suspension girder in steep gradient with supercritical flow according to used in actual engineering and received perfect effect . experimental studies about the distribution velocity , the variation of water surface and pressure are undertaken 然而，文章主要针对已获国家自然科学基金资助，且已在实际工程实践中产生了良好消能效果的陡坡急流悬栅消能工的部分试验成果，进行了较全面深入地讨论，即具体根据试验资料系统分析了悬栅陡槽内泄水时的流速分布、底板压力分布及水面线变化情况。
Using flood progress model and the different discharge of feilaixia reservoir , we can calculate in time the water level and discharge of middle - lower reaches of beijiang , thus increase the accuracy of flood forecast and provide the important technical support for the further research on the optimal dispatch method of f lood control system 其中依据水文学和水力学相结合的洪水演进模型，可根据飞来峡水库不同的下泄流量，及时计算北江中下游河道的水面线和下泄流量，提高了洪水预报的精度，为进一步研究防洪体系优化调度方法提供极其重要的技术支撑。
In this paper , remote sensing picture is processed by erdas , a famous rs & gis platform , and information on the chong qing part of the yangtze river is obtained , which can be compared with the water level data from numerical calculation and evaluate the computation precision of mathematical models 本文利用著名的rs & gis软件平台erdas对遥感图片进行处理，获取长江重庆河段河网的信息。可以将提取的河道水面线与数学模型计算的水面线进行比较，对数学模型的计算精度作一个评估。
So far as the aqueduct with large discharge and lower head is concerned , the non - uniform flow will occur in the aqueduct , when the discharge is enlarged after the water - carrying section being determined based on the design discharge and the given head ; for which the flow condition must be presumed , so as to determine the water surface profile 摘要大流量低水头渡槽根据设计流量和给定水头确定过水断面后，通过加大流量时，渡槽内就会发生非均匀流，需对这种水流情况进行推算，以确定渡槽在通过加大流量时的水面线。
