A Mesoscale Predictive Model of the Evolution and Management of a Soft-Rock Coast
A Mesoscale Predictive Model of the Evolution and Management of a Soft-Rock Coast
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DOI：
10.2112/jcoastres-d-10-00099.1
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发表时间：
2011-05
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影响因子：
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通讯作者：
M. Walkden;Jim W Hall
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文献类型：
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作者：
M. Walkden;Jim W Hall
摘要本文介绍了侵蚀软岩和海岸的中尺度数值地貌模型的发展、行为和应用。SCAPE（软悬崖和平台侵蚀）模型描述了海岸过程和工程干预措施，是测试管理策略的合适工具。SCAPE具有中尺度能力，因为它包含了一个广泛的系统：其主要模块描述了波浪转换、平台侵蚀和（单线）海滩。模块内部和模块之间的反馈调节了它们的行为，带来了长期（动态）稳定性，并允许对不同性质的海岸行为进行量化表示。SCAPE通过建造北诺福克海岸30多公里的模型来演示。预校准初始化阶段需要允许动态平衡出现。一旦初始化、校准并根据87年的记录进行验证，该模型将用于探索2003年至2053年北诺福克海岸在六种管理方案下的发展。该模型还用于证明在这些情景下侵蚀的损失和收益，并揭示了两种定性不同的行为模式，称为岩石强度有限侵蚀和沉积物运输有限侵蚀。讨论了这些不同模式的一般含义。
Abstract This paper describes the development, behaviour, and application of a mesoscale numerical geomorphological model of eroding soft rock and beach shores. The model, SCAPE (Soft-Cliff and Platform Erosion), describes coastal processes and engineering interventions and is a suitable tool for testing management strategies. The mesoscale capability of SCAPE arises because it includes a broad system: its principal modules describe wave transformation, platform erosion, and a (one-line) beach. Feedback within and between the modules regulates their behaviour, brings long-term (dynamic) stability, and allows quantified representation of qualitatively different shore behaviours. SCAPE is demonstrated through the construction of a model of more than 30 km of the North Norfolk coast. A precalibration initialisation phase is required to allow dynamic equilibrium to emerge. Once initialised, calibrated, and validated against an 87-year record, the model is used to explore the development of the North Norfolk coast from 2003 to 2053 under six management scenarios. The model is also used to demonstrate the losses and benefits of erosion under these scenarios and to reveal two qualitatively different modes of behaviour, termed rock strength limited erosion and sediment transport limited erosion. Some generic implications of these different modes are discussed.