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A RETURN PERIOD SPECIFIC UNIT HYDROGRAPH

机译：返回期特定单位水文

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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年首次由Sherman推出以来，单位的水文理论已被纳入今天用于设计水文的许多程序中。这些程序包括若干合成单位的水文理论，可应用于未经过奇格的流域。这些理论中最常用的包括斯奈德在1938年开发的斯奈德理论，1957年制定的土壤保护服务的理论。这些方法没有大大改善，因为它们在当时的有限供应水文数据的发展。该程序被国家和联邦监管机构接受，今天仍在使用中。然而，有研究表明这些方法可以改善。该分析借鉴了这些单元水文理论和后期研究，提出了一种改进的单位水文理论。改进的理论类似于当前方法，因为它具有峰值流量和峰值方程的时间。然而，差异是，这些方程现在能够考虑设计风暴的返回时期。例如，已经表明，峰值流动方程中使用的峰值流量因子可能在流域之间变化。现在，将表明，峰值流量因子也在流域内变化，以用于不同的洪水幅度。最终目标是具有一个单位的水文，可根据其特征对流域进行特定于流域，并使用单位水文的返回时间。

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