舟山基湖海岸岸线形态与稳定性

COAST CONFIGURATION AND STABILITY OF JIHU BEACH,ZHOUSHAN

抛物线模型是确定岬间海湾静态平面平衡形态中应用最广泛的关系式。应用此模型研究了舟山基湖砂质岸线的平面形态与稳定性,并通过近年来的海滩冲淤变化分析与沿岸输沙计算,对模型判定结果进行了对比验证。结果显示,基湖岸线已接近静态平衡,西北部略有淤进,中部稳定,东南部将有较大程度的淤进;模型判定结果与其他2种方法得出的结论相一致,印证了抛物线模型应用于此的合理性。

The parabolic model has been widely used to determine the coastal configuration and stabili- ty in evaluation of the static equilibrium of the morphology of a bay. We adopted the model in this pa- per to study the coastal morphology and stability of the Jihu sandy beach in Zhoushan, China, based on the analysis of erosional and depositional pattern and the calculation of alongshore sediment trans- port. The results indicate that the coastline configuration of the Jihu beach is approaching a steady state. The middle part of the coast is rather stable, and the northwest part of the coast is under slight deposition, while heavy deposition might occur in the southeast corner. The results from the parabolic modeling are in consistent with the results from other two methods. It suggests that the model could produce a reasonable result and be suitable for evaluation of coastal morphology on the Jihu sandy beach.