Journal of Tropical Oceanography ›› 2017, Vol. 36 ›› Issue (3): 46-54.doi: 10.11978/2016079CSTR: 32234.14.2016079

• Orginal Article • Previous Articles     Next Articles

Study on the tidal dynamics in Daya Bay, China — Part Ⅱ. The generation of double high waters and double-peak flood-current flows

Yuhan YAN1,2(), Wen WU2, Dehai SONG1(), Xianwen BAO1,2   

  1. 1. Key Laboratory of Physical Oceanography, Ministry of Education, Ocean University of China, Qingdao 266100, China
    2. College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
  • Received:2016-08-23 Revised:2016-09-22 Online:2017-05-20 Published:2017-06-01
  • About author:

    Author:QIU Chunhua.E-mail: qiuchh3@mail. sysu.edu.cn

  • Supported by:
    Major State Basic Research Development Program (2015CB452905);China Postdoctoral Science Foundation (2015T80742)

Abstract:

This paper is the second part of our studies on tidal dynamics in Daya Bay (DYB), China. It illustrates the generation mechanism of double high waters and double-peak flood-current flows. Double high waters resulted from a subtle interaction between a semi-diurnal tide (M2) and higher harmonics (M4 and M6) in DYB. Based on previous studies, the conditions to produce double high waters and double-peak flood-current flows were found in this study by using an analytical method. The double high waters could be generated by combinations of M2/M6 tides (limited in the Fanhe Harbor) or M2/M4/M6 tides; however, the combination of M2/M4 tides failed to produce this unique phenomenon in DYB. Besides, the water falling range between two high waters generated by the combination of M2/M4/M6 tides was larger than that of M2/M6 tides, both in extension and in magnitude. The combinations of M2/M4, M2/M6 and M2/M4/M6 were all able to produce double-peak flood-current flows, but the magnitude of M2/M4/M6 triplet was larger than the other two pairs in DYB.

Key words: Daya Bay, double high waters, double-peak flood-current flows, sexta-diurnal tides, numerical simulation