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Spatial distribution of bedforms and related flow processes around canyon mouths: Insights from the Rovuma Basin (offshore Mozambique)
Basin Research ( IF 2.8 ) Pub Date : 2024-07-18 , DOI: 10.1111/bre.12887 Yuhang Chen 1, 2, 3, 4 , Yintao Lu 5 , Xiaofeng Wang 6 , Guozhang Fan 5 , Lin Li 5 , Xiaoyong Xu 5 , Guoping Zuo 5 , Dali Shao 5 , Quanbin Cao 5
Basin Research ( IF 2.8 ) Pub Date : 2024-07-18 , DOI: 10.1111/bre.12887 Yuhang Chen 1, 2, 3, 4 , Yintao Lu 5 , Xiaofeng Wang 6 , Guozhang Fan 5 , Lin Li 5 , Xiaoyong Xu 5 , Guoping Zuo 5 , Dali Shao 5 , Quanbin Cao 5
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Bedforms associated with turbidite systems are commonly observed on seafloor. Previous studies have analysed bedform morphological and sedimentary features to determine their formation mechanisms and flow dynamics. However, the seafloor topography and ocean circulation have comprehensively influenced both down‐ and along‐slope turbidity flow processes, complicating the spatial distribution of the related bedforms. Three‐dimensional seismic data (3D) were used to depict the morphological and sedimentary features of the bedforms around the canyon mouth on the slope of the Rovuma Basin (offshore Mozambique), to reveal the spatial distribution and related flow processes of the bedforms. The results show that the spatial morphological and sedimentary features of the submarine bedforms at canyon mouths are controlled by the combined action of down‐ and along‐slope factors. The along‐slope bottom currents influence the deposition distribution of the turbidity current at the canyon mouth. However, slope breaks control bedform morphological and sedimentary features during downslope turbidity currents. Coarse‐grained material of turbidity current flows along the axial zone of the canyon mouth, forming a linear series of crescent‐shaped net‐erosional cyclic steps characterized by short steep stoss sides and long gentle lee sides. The fine‐grained material of the turbidity currents is deflected towards the northern flank of the axial zone by the bottom currents and deposited as undulating net‐depositional cyclic steps at upper reach of the northern flank, showing long gentle stoss sides and short steep sides. Slope breaks enhance the erosion on cyclic steps by altering the velocity of turbidity current, forming net‐erosional cyclic steps with the manifestation of both short and steep stoss and lee sides at lower reaches of northern flank. The turbidity current in the axial zone formed lateral flow diversions caused by the obstruction of the cyclic steps. The flow diversions converge with the downslope flowing unconfined turbidity current at the northern flank and constitute a confluence characterized by continuous variation of flow properties, forming the cyclic steps featuring irregular morphology.
中文翻译：
峡谷口周围地床形态和相关流动过程的空间分布：来自鲁伍马盆地（莫桑比克近海）的见解
与浊积岩系统相关的床状通常在海底观察到。先前的研究分析了床型形态和沉积特征，以确定其形成机制和流动动力学。然而，海底地形和海洋环流综合影响了顺坡浊流过程和顺坡浊流过程，使相关底貌的空间分布变得复杂化。利用三维地震数据（3D）描绘了鲁伍马盆地（莫桑比克近海）斜坡峡谷口周围的地貌和沉积特征，揭示了地貌的空间分布和相关的流动过程。研究结果表明，峡谷口海底地貌的空间形态和沉积特征受顺坡因素和下坡因素共同作用的控制。沿坡底流影响峡谷口浊流沉积分布。然而，坡折控制了下坡浊流期间的地貌形态和沉积特征。浊流的粗粒物质沿着峡谷口的轴向区域流动，形成一系列线性的新月形净侵蚀循环台阶，其特征是短的陡峭的背风面和长的平缓的背风面。浊流的细粒物质被底流偏转至轴带北翼，在北翼上游沉积成起伏的净沉积旋回台阶，呈现出长的缓坡面和短的陡坡面。 坡折通过改变浊流流速，增强了旋回台阶的侵蚀，形成净侵蚀旋回台阶，在北翼下游表现为短而陡的冲沙和背风面。轴向区域的浊流由于循环台阶的阻碍而形成侧流导流。导流与北翼下坡流动的无侧限浊流汇合，构成流动特性连续变化的汇流，形成形态不规则的循环台阶。
更新日期：2024-07-18
中文翻译：
峡谷口周围地床形态和相关流动过程的空间分布：来自鲁伍马盆地（莫桑比克近海）的见解
与浊积岩系统相关的床状通常在海底观察到。先前的研究分析了床型形态和沉积特征，以确定其形成机制和流动动力学。然而，海底地形和海洋环流综合影响了顺坡浊流过程和顺坡浊流过程，使相关底貌的空间分布变得复杂化。利用三维地震数据（3D）描绘了鲁伍马盆地（莫桑比克近海）斜坡峡谷口周围的地貌和沉积特征，揭示了地貌的空间分布和相关的流动过程。研究结果表明，峡谷口海底地貌的空间形态和沉积特征受顺坡因素和下坡因素共同作用的控制。沿坡底流影响峡谷口浊流沉积分布。然而，坡折控制了下坡浊流期间的地貌形态和沉积特征。浊流的粗粒物质沿着峡谷口的轴向区域流动，形成一系列线性的新月形净侵蚀循环台阶，其特征是短的陡峭的背风面和长的平缓的背风面。浊流的细粒物质被底流偏转至轴带北翼，在北翼上游沉积成起伏的净沉积旋回台阶，呈现出长的缓坡面和短的陡坡面。 坡折通过改变浊流流速，增强了旋回台阶的侵蚀，形成净侵蚀旋回台阶，在北翼下游表现为短而陡的冲沙和背风面。轴向区域的浊流由于循环台阶的阻碍而形成侧流导流。导流与北翼下坡流动的无侧限浊流汇合，构成流动特性连续变化的汇流，形成形态不规则的循环台阶。
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