Understanding Our Bangkok Tide Tables

Posted on 11/03/11 3 Comments These has been some discussion in various discussion forums on the Internet about why our Bangkok Tide Tables show different tidal data than some other tidal data sites. One reason might be because there are more than one tidal stations in the Bangkok area. Our tide server has harmonic tidal data for two locations, "Bangkok" and "Tachin". The tidal data for "Bangkok" may actually be located about 10 KM south of the mouth of the Chao Phraya river; and the data for "Ta Chin" is possibly located about 35 KM west of the mouth of the Chao Phraya river at the mouth of the "Tha Chin" river. These estimated locations are based on the geographic coordinates used in our XTide server as superimposed on Google Maps. If you take a look and compare these two tables, "Bangkok"" and "Ta Chin", you will see that the tidal data for "Bangkok" is generally higher (around 0.8 to 0.9 meters) than for "Ta Chin", which is in Samut Sakhon at the mouth of the Ta Chin River on the Gulf of Thailand. For completeness, in the future we will add some special charts that compare the two locations, similar to what we do for the Pattaya area tides, where we show both Ko Si Chang and Sattahip tide charts on the same page.

3 Comments

  1. Neo says:
    Thursday, November 3, 2011 at 3:12am

    See also, Tachin River Estuary by Gullaya Wattayakorn:

    http://nest.su.se/mnode/asia/thailand/tachinriver/tachinbud.htm

    “The Tachin River (13.50o-15.50oN, 99.00o-100.50oE) is an effluent branch of the Chao Phraya River, in the central plain of Thailand. The Tachin River basin covers an area of approximately 11,000 km2, contains a population of about 2 million, and is the second most important watershed in the central plain. The main channel of the Tachin River is defined as the 320 km stretch flowing from the Chao Phraya River (in the north) to the Gulf of Thailand (in the south). The depth of the river ranges from 3 to 12 m and the width ranges from 100 to 600 m. Annual rainfall varies from 1,030 to 1,200 mm, with the maximum average in September, at 276 to 232 mm and the minimum average in January, at 7 to 10 mm. The temperatures are usually highest in March or April and lower between November and January. The highest monthly evaporation is observed in March and April, being 250 mm, whereas the lowest evaporation is normally in November, at 130 mm.”

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  2. Neo says:
    Thursday, November 3, 2011 at 2:40am

    The same article goes on to say:

    “This name [Tachin] is still much in use also on, for example, road signs, so don’t get confused; but the official name of the fishing town today is Samut Sakhon located around 35 kilometers west of Bangkok.”

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  3. Neo says:
    Thursday, November 3, 2011 at 2:35am

    An article called The ‘Danish’ Tachin Railway states:

    “However, to this day the International Tide Table uses the name Tachin for their station at the bay.”

    Reference:

    http://www.scandasia.com/viewNews.php?coun_code=dk&news_id=8718

    But on the other hand, the location on the Gulf of Thailand at the mouth of the Ta Chin River does not match the coordinates of the “Tachin” station in XTide, which is at 13.5333° N, 100.2833° E.

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