flood

This paper expounds the problems related to flood control to flood control planning for the outlet section of Nandu River and makes an ap-proach to the principle and dertermination of planning for flood control regulation lines, the determination of relevant parameters andcalculation conditions in analizing flood and tidal levels and the calculation of wave run-up.

本文论述了南渡江河口段防洪规划有关问题，对防洪治导线规划布置原则及其确定、洪潮水位分析计算中有关参数及计算条件的确定、波浪爬高计算等进行探讨。

tail up and down the stream

随着潮水涨落而起伏

(of the tide)start to come in or go out

（指潮水）开始涨或落

The tide ebbs and flows twice in 24 hours.

潮水每24 小时涨落两次。

Every tide have its ebb.

潮水有涨落，人生有盛衰。

the high [low] watermark

(涨 [落] 潮时的) 最高 [最低] 水位标

A line or an artificial indicator marking the high-water or low-water limit of the tides.

潮痕标记涨潮和落潮时潮水边缘的线或人为的标记

Is the tide coming in or going out?

现在是涨潮还是落潮?

The flood and ebb tides alternates with each other.

涨潮和落潮交替更迭。

The tide of commuters ebbed and flowed.

乘公交车辆上下班的人流，像潮水一样时涨时落。

The study of hydrodynamic characteristics of flood and ebb channels and channel type judgment

河口涨落潮槽水动力特征及河槽类型判定

It was the best time for snorkeling, since the visibility at high tide is not good enough and the water is too shallow at low tide.

这是潜水的最好时候，因为涨潮时能见度不够高，而潮落时水又太浅。

Water level upstream is higher than that downstream during the ebb tide, and water level descent of ebb tide is one order bigger than that of flood tide.

落潮期间上游水位均大于下游水位,水面坡降落潮比涨潮大一个数量级;

the rhythm of the tides, seasons

潮汐的涨落、 四季的循环

Results show that (a) the flood tidal duration is shorter than the ebb tidal one;

结果表明 :潮流历时涨潮比落潮短 ;

the range and rotation during the flood is larger than during the ebb.

落潮历时一般大于涨潮历时，而落潮流速明显大于涨潮；

At the lower reaches of the South Branch, the velocity of the ebb current is larger than that of the flood current and the ebb tide duration is longer than that of the flood.

在南支下游,落潮流大于涨潮流,落潮历时大于涨潮历时;

(be)in a state of flux and reflux

处于潮涨潮落状态;[喻](人、事)荣枯, 盛衰

(be) in a state of flux and reflux

处于潮涨潮落状态; [喻](人、事)荣枯, 盛衰