VARIATION IDENTIFICATION OF HIGH TIDE LEVEL IN HANGZHOU BAY

摘要

Variation of hydrological regime occurred timely or spatially due to natural hydrologic cycle change and human activities. It is necessary to comprehend and distinguish when or where the variation occurs in hydrologic simulation, forecasting and hydrologic computation in order to adopt feasible measures. This paper adopts differential information theory to identify change points in time series. Key step of variation identification is to built up comparing sequence. Two methods are introduced, one is comparing series formed of moving partition step by step, another is comparing series formed of order clustering optimum bi-partition. The two means are applied in analysis of change point of annual maximum tidal level series at Ganpu station and get the unanimous result.