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Posted on June 2, 2023 (Updated on July 9, 2025)

Revisiting the Applicability of the Iribarren Criteria to Tsunamis

Safety & Hazards

The Iribarren number, also known as the surf similarity parameter, is a dimensionless parameter used to describe the interaction between waves and beaches. The Iribarren Criteria, based on this number, is a widely used guideline for determining whether waves break as spilling or plunging waves. This criterion has been used extensively in coastal engineering to design structures such as breakwaters, jetties, and seawalls. The question remains, however, whether the Iribarren criterion is applicable to tsunamis.

The Iribarren Criteria

The Iribarren Criteria is based on the Iribarren Number, which is defined as the ratio of wave height to the product of wavelength and water depth. The Iribarren number is an important parameter in determining whether a wave will break as a spilling or plunging wave. Waves with an Iribarren number less than 0.5 are classified as spilling waves, while waves with an Iribarren number greater than 1.0 are classified as plunging waves. Waves with an Iribarren number between 0.5 and 1.0 are transition waves.

Applicability of the Iribarren Criteria to Tsunamis

The Iribarren criterion was developed for regular waves, i.e. waves with a constant wavelength and period. Tsunamis, on the other hand, are characterized by irregular waves with a wide range of wavelengths and periods. Therefore, it is unclear whether the Iribarren criteria can be applied to tsunamis.

Recent studies have shown that the Iribarren criteria may not be applicable to tsunamis. This is because tsunamis are not classified as plunging or spilling waves, but rather as bores, which are waves that propagate as a front of undisturbed water. Tsunami bore waves are characterized by a steep wave front, which can cause significant damage to coastal structures. It is therefore important to develop new criteria for assessing the interaction between tsunamis and coastal structures.

Conclusion

In conclusion, the Iribarren criteria is a widely used guideline for determining whether waves break as spilling or plunging waves. However, its applicability to tsunamis is still unclear. Recent studies have shown that tsunamis are not classified as plunging or spilling waves, but rather as bore waves. Therefore, it is important to develop new criteria to assess the interaction between tsunamis and coastal structures. Further research is needed to determine the applicability of the Iribarren criteria to tsunamis and to develop new criteria for assessing the interaction between tsunamis and coastal structures.

FAQs

1. What is the Iribarren criteria?

The Iribarren criteria is a guideline used to determine whether waves will break as spilling or plunging waves. It is based on the Iribarren number, which is a dimensionless parameter that describes the interaction between waves and beaches.

2. How is the Iribarren number calculated?

The Iribarren number is calculated as the ratio of wave height to the product of wavelength and water depth.

3. Can the Iribarren criteria be applied to tsunamis?

The applicability of the Iribarren criteria to tsunamis is still unclear. Recent studies have shown that tsunamis are not classified as plunging or spilling waves, but rather as bores, which are waves that propagate as a front of undisturbed water.

4. What are the limitations of the Iribarren criteria when it comes to tsunamis?

The Iribarren criteria was developed for regular waves, which are waves with a constant wavelength and period. Tsunamis, on the other hand, are characterized by irregular waves with a wide range of wavelengths and periods. Therefore, it is unclear whether the Iribarren criteria can be applied to tsunamis.

5. Why is it important to develop new criteria for assessing the interaction between tsunamis and coastal structures?

Tsunamis are capable of causing significant damage to coastal structures due to their steep wave front. Therefore, it is important to develop new criteria that can accurately assess the interaction between tsunamis and coastal structures, in order to improve the design of coastal structures and reduce the risk of damage and loss of life.

6. What are the characteristics of tsunami bores?

Tsunami bores are characterized by a steep wave front, which can cause significant damage to coastal structures. They propagate as a front of undisturbed water, and are characterized by irregular waves with a wide range of wavelengths and periods.

7. What is the future of research on the applicability of the Iribarren criteria to tsunamis?

Further research is needed to determine the applicability of the Iribarren criteria to tsunamis and to develop new criteria for assessing the interaction between tsunamis and coastal structures. This research will help to improve the design of coastal structures and reduce the risk of damage and loss of life in the event of a tsunami.

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