针对核电冷源取水安全的海流特征分析

冷源取水安全是核电安全运行的重要环节，并受到多种外海堵塞物的巨大威胁。为有效指导冷源取水堵塞物的防治工作，本文对取水口周围小区域的实测海流数据进行分析。分析发现，受取水影响，取水口附近海域的海流分别为准定常流特征、非规则潮流特征和潮流特征。准定常流区基本分布在取水湾内，且在取水湾口的西南部100 m范围内有延伸分布。非规则潮流区分布在取水湾口外侧，半径约为50 m的区域。距离取水口300 m外的海域基本为潮流特征，受取水影响较小。同时，外海的余流流向为平行岸线的SW向，而取水湾内的余流受取水影响，指向取水口方向，且流速较大。取水湾口的余流较小，受潮流和取水的共同影响。距离取水口300 m范围内的海域，有指向取水口的余流净输运，是防治堵塞物的重点区域。

The characteristic analysis of ocean current for the safety of cold resource of nuclear power station

The water intake of cold resource is an important part of the safety for nuclear power station, and it could be threatened by different blockages from the open sea. In order to prevent the blockage, this paper makes an analysis on the ocean current data of a small area near the water intake. Bases on the analysis, there are different types of ocean current near the water intake, such as semi-stable current, irregular tidal current and tidal current. The semi-stable current mainly distributes in the inlet of water intake, and there is an extension of 100 m in the south-west of the inlet. With a radius of 50 m, the irregular tidal current area locates in the outside of the inlet. The tidal current area is about 300 m outside the water intake. The residual current in the open sea is parallel with the coastal line whose direction is southwest. The velocity of residual current in the inlet of water intake is bigger than in the open sea because of the water intake. The residual current which is influenced by the tide and water intake is small near the mouth of the inlet. With a distance of 300m to the mouth of inlet, there is a net transport of residual current pointing to the water intake. The net transport of residual current area is vital to the blockage preventing.