SHORT AND MEDIUM-TERM EVOLUTION OF THE NORTHERN BANK, HANGZHOU BAY

Understanding of coastal change during the short and medium-term is necessary for proper management of coastal resources, particularly in light of widespread coastal retreat. In this study, based on analysis of field data and sea maps, the characteristic of the northern bank, Hangzhou bay (NBHZB) is of accretion in winter half year and erosion in summer half year, respectively, due to the impacts of seasonal wave climate actions. However, coastal morphodynamic processes during typhoon actions could be described as that the crest of submarine bar was cut down, runnel was filled up and submarine platform was eroded into several similar shape of small bar-runnel. In addition, coastal erosion had drastically occurred along NBHZB in recent 20 years, which could be induced by the abrupt decreased sediment from Yangtze River.