AI 中文总结
研究路易斯安那州南部陆地季节性垂直运动，通过卫星大地测量记录分析，建立多孔弹性模型，发现断层-河流交汇处是季节性通道，该因素对海岸陆地运动有控制作用，且可能随水文极端事件加剧而增强。
AI 中文摘要
路易斯安那州海岸正在下沉，加剧了洪水和土地流失，但其运动的季节性成分仍难以归因。2004年至2024年巴吞鲁日的卫星大地测量记录显示长期沉降为-2.69±0.69毫米/年，叠加有10至15毫米的年振荡，与河流水位和承压含水层水头同相。这种正相关表明是多孔弹性变形而非表面载荷。由水头变化驱动的半承压含水层多孔弹性模型再现了长期和季节性信号。季节性振幅随距巴吞鲁日断层与密西西比河交汇处的距离呈对数下降，断层-河流交汇处因此成为进入深层含水层的季节性通道，这一海岸陆地运动控制因素可能因水文极端事件加剧而增强。
英文摘要
Coastal Louisiana is sinking, amplifying flooding and land loss, yet the seasonal component of this motion remains difficult to attribute. Satellite geodetic records from Baton Rouge spanning 2004-2024 reveal long-term subsidence of -2.69 +/- 0.69 mm/yr, with a superimposed annual oscillation of 10-15 mm that is in phase with river stage and confined-aquifer hydraulic head. This positive correlation is diagnostic of poroelastic deformation rather than surface loading. A poroelastic model of a semi-confined aquifer driven by hydraulic-head variations reproduces both the long-term and seasonal signals. The seasonal amplitude decreases logarithmically with distance from the intersection of the Baton Rouge Fault and the Mississippi River, as expected for radial pressure diffusion from a flux source. Fault-river intersections therefore act as seasonal conduits into deep aquifers, representing an underappreciated control on coastal land motion that is likely to strengthen as hydrological extremes intensify.
