Already for some time discrepancies between the forecasts and observed water
levels have been reported which seem to have a periodic nature.
In this report, the periodic structure of the forecast errors is analyzed
in more detail and a set of regression equations to compensate for these
systematic errors is developed for the main locations along the coast of
The Netherlands.
The report is available as a postscript file.
The report is also available on-line in html format:
The figures from the report are separately available. There are also figures which have not been included in the report (only available from within KNMI). They compare the bias, standard deviation and rms before and after correction as a function of time from 1994:
| Vlissingen: | from the report, | extra for high tides, | extra for low tides |
| Roompot Buiten: | from the report, | extra for high tides, | extra for low tides |
| Hoek van Holland: | from the report, | extra for high tides, | extra for low tides |
| IJmuiden: | from the report, | extra for high tides, | extra for low tides |
| Den Helder: | from the report, | extra for high tides, | extra for low tides |
| Harlingen: | from the report, | extra for high tides, | extra for low tides |
| Delfzijl: | from the report, | extra for high tides, | extra for low tides |
The bibliographic information of the report (in BibTeX format) is:
@techreport{BruV01,
author = "Cisco de Bruijn and Hans de Vries and Janet Wijngaard",
title = "Statistical correction of periodic errors
in sea level forecasts",
institution = "KNMI",
type = "Memorandum",
number = "WM--01--03",
year = 2001,
month = apr,
note = "Unpublished Manuscript" }
