Διόρθωση-ομογενοποίηση βροχομετρικών δεδομένων του νομού Χανίων.

Abstract

Η συνοχή/συνάφεια των εγγραφών στο βροχομετρικό σταθμό ελέγχεται από μια διπλή καμπύλη μάζας με τεταγμένη τη σωρευτική ετήσια (ή εποχική) βροχής στο σταθμό κατά την ταυτόχρονη σωρευτικές τιμές της μέσης ετήσιας (ή εποχική) βροχόπτωσης για μια ομάδα γύρω από τους σταθμούς, για την αριθμό των ετών της εγγραφής

Double-mass analysis-The trend of the rainfall records at a station may slightly change after some years due to a change in the environment (or exposure) of a station either due to coming of a new building, fence, planting of trees or cutting of forest nearby, which affect the catch of the gauge due to change in the wind pattern or exposure. The consistency of records at the station in question is tested by a double mass curve by plotting the cumulative annual (or seasonal) rainfall at station against the concurrent cumulative values of mean annual( or seasonal) rainfall for a group of surrounding stations, for the number of years of record. From the plot, the year, the year in which a change in regime (or environment) has occurred is indicated by the change in slope of the straight line plot. The rainfall records of the station are adjusted by the multiplying the recorded values of rainfall by the ratio of slopes of the straight lines before and after change in environment.