Measurement of River Bores

Abstract

WITH reference to the note in NATURE of April 25, p. 711, concerning the observations of the bore in the River Trent, may I direct attention to the observations made by the surveyors of Whangpoo Conservancy Board in February 1920 on the famous bore of the Ch'ien Tang River—Apart from general tide readings, special water-levels were observed every ten minutes during the day and every minute for one hour before and after the passing of the bore, at six stations covering a reach of 18½ miles, for two weeks. The maximum height of the vertical face of the bore was 4½ feet, the total rise in that tide being about 16 feet.