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   Nezami, Sepehr; Lin, Henry W.; Brown, Adam R.; Gharibyan, Hrant; Leichenauer, Stefan; Salton, Grant; Susskind, Leonard; Swingle, Brian; Walter, Michael (February 2021, ArXivorg)

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3. Solitary waves perturbed by a broad sill. Part 2. Propagation along the sill

   https://doi.org/10.1017/jfm.2019.873  

   Yeh, Harry; Ko, Harrison; Knowles, Jeffrey; Harry, Samuel (January 2020, Journal of Fluid Mechanics)

   Evolution of a solitary wave travelling along a submerged sill is studied. The disturbance from the sill creates a phase lag along the wave crest between the ambient water depth and the shallower depth over the sill. This phase lag causes wave diffraction between the different parts of the wave, which induces radiating waves off the edge of the sill. The radiating waves act as an outlet for wave energy, resulting in significant and continual amplitude reduction of the solitary wave. Findings from laboratory experiments are confirmed numerically by simulating a much longer propagation distance with different sill breadths. When the sill breadth is narrow, the solitary wave slowly attenuates by wave radiation, maintaining a quasi-steady wave pattern. This is not the case for a broader sill. The resulting phase lag on the sill continually changes the wave pattern and the attenuation rate is substantially greater than the rate for the case of the narrow sill. The significant energy radiation together with the continual change in the wave formation eventually leads to the complete annihilation of the solitary wave in a wave tank. We also report a wave-breaking process along the sill observed in laboratory experiments. This breaking is induced when the wave amplitude on the sill is smaller than the maximum amplitude of a solitary wave in a uniform depth. Also found is the wake-like formation of gravity–capillary waves behind the breaking crest forming on the sill. Other features associated with the breaking are presented. 

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4. Solitary waves perturbed by a broad sill. Part 1. Propagation across the sill

   https://doi.org/10.1017/jfm.2019.712  

   Ko, Harrison T.-S.; Yeh, Harry (December 2019, Journal of Fluid Mechanics)

   Stability of a solitary wave disturbed by a submerged flat sill is investigated experimentally. For sills narrow compared with the solitary wave, the transmitted waves are found to be unaffected in waveform and amplitude. A wider sill disturbs the solitary wave resulting in the formation of a dispersive wavetrain following the transmitted wave. In some cases, the wave amplitude recovers, despite being perturbed, to the state of an unobstructed solitary-wave state at a certain distance beyond the sill. Wider sills cause wave breaking that occurs over the sill or, in some cases, after the wave passes through the sill. Details of waveform transformation leading toward the breaking and subsequent energy dissipation are discussed. 

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5. Untangling the evolution of body-part terminology in Pano: conservative versus innovative traits in body-part lexicalization

   https://doi.org/10.1098/rsfs.2022.0053  

   Zariquiey, Roberto; Vera, Javier; Greenhill, Simon J.; Valenzuela, Pilar; Gray, Russell D.; List, Johann-Mattis (February 2023, Interface Focus)

   Although language-family specific traits which do not find direct counterparts outside a given language family are usually ignored in quantitative phylogenetic studies, scholars have made ample use of them in qualitative investigations, revealing their potential for identifying language relationships. An example of such a family specific trait are body-part expressions in Pano languages, which are often lexicalized forms, composed of bound roots (also called body-part prefixes in the literature) and non-productive derivative morphemes (called here body-part formatives). We use various statistical methods to demonstrate that whereas body-part roots are generally conservative, body-part formatives exhibit diverse chronologies and are often the result of recent and parallel innovations. In line with this, the phylogenetic structure of body-part roots projects the major branches of the family, while formatives are highly non-tree-like. Beyond its contribution to the phylogenetic analysis of Pano languages, this study provides significative insights into the role of grammatical innovations for language classification, the origin of morphological complexity in the Amazon and the phylogenetic signal of specific grammatical traits in language families. 

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