为了抵御汛期高重现期下设计暴雨给山谷型干灰场带来的潜在威胁，防止山洪入侵对灰场造成侵蚀破坏，根据电厂灰场相关设计标准与规范，论文结合小流域暴雨洪水特点，重点研究适用于山谷型干灰场设计洪水的计算方法。以某典型山谷干灰场为例，在对小流域不同设计洪水计算方法分析研究的基础上，采用推理公式法对灰场排水方案进行设计洪水计算分析，并结合MIKE模型HD模块进行坝前洪水汇流调蓄演算。结果表明：相比于单一的推理公式法而言，采用模型调蓄演算后的计算结果合理，比较符合山谷型干灰场设计洪水特点，可为电厂灰场建设提供设计依据，有一定的参考价值。

In order to resist the potential threat of the design storm with high return period in the flood season to Valley Dry Ash Yard and prevent the erosion damage to the ash field caused by the invasion of the flash floods，according to the relevant design standards and specifications of the power plan，based on rainstorm and flood characteristics of small watershed，this thesis focuses on the calculation method suitable for Valley Dry Ash Yard design flood． A typical Valley Dry Ash is taken as an example，on the basis of analyzing and research on the different calculation methods in small watershed design flood，this paper uses the inference formula method to design flood calculation and analyze the ash field drainage scheme，and carries on dam flood regulation and storage convergence calculation combined with MIKE model HD module． The results show that compared to the single inference formula method，the result after regulating calculation by model is reasonable， in line with Valley Dry Ash Yard features of design floods and can serve as a design basis for the construction of power plants，which has a certain reference value．