摘要
A statistic analysis predicting coastal change of the Yellow River abandoneddelta lobe formed from 1964 to 1976 using Landsat TM imagery was conducted by calculating thecoastal erosion/accumulation rates obtained from four different classic profiles and plotting thechange curves of coastline with time. The studies showed that the regularity of the evolution of thecoastline was very obvious after the delta lobe was abandoned. The coastal evolution can be dividedinto three different phases: erosion phase, transition phase and cyclical change phase. At present,the coast has evolved to the cyclical change phase. The natural coastline change cycle is 4 yearsbetween the dam and is 5 years to the west of the dam. In the cyclical change phase, thequasi-equilibrium line of the coast was located near the coastline of 1996, the current coast mayrecede 1.79 km to reach the natural equilibrium coastline. Therefore, some measures must be taken toprotect the dam or the dam will be destroyed by the force of nature. The curves also revealed themagnitude of erosion/accumulation rates would decrease gradually with time. The results of the studyoffer guidance for coast protection, and proves that the evolution of silty coast actually was acyclical change process too.
A statistic analysis predicting coastal change of the Yellow River abandoneddelta lobe formed from 1964 to 1976 using Landsat TM imagery was conducted by calculating thecoastal erosion/accumulation rates obtained from four different classic profiles and plotting thechange curves of coastline with time. The studies showed that the regularity of the evolution of thecoastline was very obvious after the delta lobe was abandoned. The coastal evolution can be dividedinto three different phases: erosion phase, transition phase and cyclical change phase. At present,the coast has evolved to the cyclical change phase. The natural coastline change cycle is 4 yearsbetween the dam and is 5 years to the west of the dam. In the cyclical change phase, thequasi-equilibrium line of the coast was located near the coastline of 1996, the current coast mayrecede 1.79 km to reach the natural equilibrium coastline. Therefore, some measures must be taken toprotect the dam or the dam will be destroyed by the force of nature. The curves also revealed themagnitude of erosion/accumulation rates would decrease gradually with time. The results of the studyoffer guidance for coast protection, and proves that the evolution of silty coast actually was acyclical change process too.
基金
国家重点基础研究发展计划(973计划)，山东省自然科学基金
