EVOLUTION AND RECOVERY OF SELF-ADAPTIVE ABILITY OF BARRIER- LAGOON SYSTEM IN DONGSHUI HARBOR

摘要

The evolution of a barrier-lagoon system keeps rapidly, and each part of the system is sensitive to the change of environment of dynamic and sedimentary conditons. As a relatively independent system, a barrier-lagoon system keeps itself balance based on the recovery ability under special conditions. Under the natural environment, it is common that the system loses its balance by rapid development of human activity, then the system loses its recovery ability of self-adapting. From a viewpoint of dynamic geomorphy, the article analyzes the ability of self-adaptaton of a barrier-lagoon system and the limitation of the ability which keeps the system in balance. The effect of waves, longshore sediment transportation, runoff, barrier and lagoon in the system is analyzed in detail by studying on the process and trends of the barrier-lagoon system in Dongshui Harbor under the action of nature and human beings. And engineering methods were carried out to recovery the ability of self-adaption and to keep the system in balance when the system lost its balance and only relied on the ability of self-adapting.