Nonlinearities detection in river-tide interaction in Río Negro hydrographic lower basin(Argentina)using higher-order spectra  

作　　者：Grethel García Bu Bucogen Gabriel Eduardo Huck María Cintia Piccolo Vanesa Yael Bohn Gerardo Miguel Eduardo Perillo 

机构地区：[1]Instituto Argentino de Oceanografía(CONICET-UNS),8000 Bahía Blanca,Buenos Aires,Argentina [2]Instituto Argentino de Oceanografía(CONICET‑UNS),Departamento de Geografía y Turismo,Universidad Nacional del Sur,8000 Bahía Blanca,Buenos Aires,Argentina [3]Departamento de Geografía y Turismo,Universidad Nacional del Sur(UNS),CONICET,Bahía Blanca,Buenos Aires,Argentina [4]Instituto Argentino de Oceanografía(CONICET‑UNS),Departamento de Geología,Universidad Nacional del Sur,Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Bahía Blanca,Buenos Aires 8000,Argentina

出　　处：《Anthropocene Coasts》2024年第1期172-189,共18页人新世海岸(英文)

摘　　要：The nonlinear interactions between river discharge,astronomical tidal wave,and local geomorphology during storm passage or water release from upstream dams can produce severe floods in the Río Negro lower basin(Argentina).For this reason,this paper aims to detect and study nonlinear processes in this area.The watercourse hydrodynam-ics was described using hourly water level data from three limnigraphs during 2003–2021 and flow time series.The tide gauge dataset was employed to describe the influence of tidal cycles on the hydrological regimen.Nonlinear processes’impact on the astronomical tidal cycle and river discharge was analyzed using Harmonic Analysis,and Fou-rier higher-order spectra,also it was complemented with the selection of two study cases.Harmonic Analysis results showed that the tidal wave entry upstream of the Río Negro modulates its hydrological regime,presenting the water column semidiurnal variations.Also,high-order spectral analysis detected nonlinear interactions in the signal in storm conditions with an energetic redistribution among the linear tidal constituents toward shallow water harmonics.Additionally,nonlinear interactions provoked a delay in the tidal ebb phase with a consequential extension of flood-ing duration time.This type of study contributes to the knowledge of the flood mechanisms activated during a storm.

关 键 词：FLOOD Flow Interacting frequencies Harmonics Nonlinear interactions TIDE 

分 类 号：P73[天文地球—海洋科学]