recurrence period meaning in English

重复周期
重现周期

Abstract : the raining time , process , area and density of the storm resulting in the nenjiang flood in august 1988 and its recurrence period were analyzed . the disaster data of the flood was also presented
文摘:论述了形成1988年8月嫩江大洪水的降雨发生时间及过程、雨区范围、降雨强度，分析了该次洪水的峰、量组成情况及稀遇程度，汇集了灾情损失数据。
Taking a specialized port in eastern guangdong as an example this paper puts forward the layout pattern and design standard of breakwater , i . e . , determining the sectional dimensions of the breakwater according to wave factors of 2 years ' recurrence period , which not only ensures favorable berthing condition in port , but also control effectively the engineering cost
摘要以粤东地区某专用港为例，对防波堤的布置形式及设计标准提出按2年一遇波要素确定防波堤断面尺寸，在保持港内有较好的泊稳条件的同时，可以有效控制工程投资。