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首页> 外文会议>Association of State Dam Safety Officials, Inc. 2002 Annual Conference Sep 8-11, 2002 Tampa, Florida >A RETURN PERIOD SPECIFIC UNIT HYDROGRAPH
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A RETURN PERIOD SPECIFIC UNIT HYDROGRAPH

机译：返回周期特定单位的水位图

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摘要

Since first being introduced by Sherman in 1932, unit hydrograph theory has been incorporated in many of the procedures used today for design hydrology. These procedures include several synthetic unit hydrograph theories that can be applied to ungaged watersheds. The most commonly used of these theories include Snyder's theory developed in 1938 and the Soil Conservation Service's theory developed in 1957. There has not been much improvement in these methods since their development from a limited supply of hydrologic data at the time. The procedures were accepted by state and federal regulatory agencies and are still in use today. However, there are studies that show that these methods could be improved upon. This analysis draws on these unit hydrograph theories and the later studies to propose an improved unit hydrograph theory. The improved theory is similar to the current methods in that it has a peak flow and time to peak equation. However the difference is that these equations are able to now account for the return period of the design storm. For example, it has been shown that the peak flow rate factor used in the peak flow equation is likely to vary among watersheds. Now, it will be shown that the peak flow rate factor also varies within the watershed for different flood magnitudes. The final goal is to have a unit hydrograph that can be made specific to the watershed, based on its characteristics, and return period for which the unit hydrograph is being used.
机译：自1932年由谢尔曼（Sherman）首次提出以来，单位水位图理论已被纳入当今用于设计水文学的许多程序中。这些程序包括几种可应用于非流域集水区的合成单元水文理论。这些理论中最常用的包括1938年开发的Snyder理论和1957年开发的土壤保持局理论。由于当时水文资料的供应有限，这些方法没有得到很大的改进。该程序已被州和联邦监管机构接受，并且今天仍在使用。但是，有研究表明可以改进这些方法。该分析借鉴了这些单位水文理论，并在后来的研究中提出了一种改进的单位水文理论。改进的理论与当前方法类似，因为它具有峰值流量和达到峰值的时间方程。但是，不同之处在于，这些方程式现在能够说明设计风暴的恢复期。例如，已经显示出在峰值流方程中使用的峰值流率因子可能在流域之间变化。现在，将表明，对于不同的洪水幅度，流域内的峰值流速因子也有所变化。最终目标是要有一个单位水位图，它可以根据流域的特征和使用单位水位图的返回周期而特定于流域。

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