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Tidal impacts on downstream hydraulic geometry of a tide-influenced delta

机译:潮汐影响三角洲下游液压几何的潮汐影响

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摘要

Variations in river hydraulic geometry (HG) are of fundamental importance to fluvial geomorphological research and catchment management. In tide-influenced river deltas, channel geometry displays a mixed scaling behavior since the channel forming discharge is of both tidal and river origins. This study aims to map the tidal signature on delta morphology in the Pearl River Delta (PRD) channel network. The model results of a 2D numerical model are used to analyze the spatial variations of river and tidal discharges and their relations with representative channel geometry throughout the delta. Downstream HG of the distributary channels in the PRD features distinct characteristics in three zones. The transition points in morphology, which splits the delta into river- and tide-dominated parts, coincide with those in the mean flow velocity, the ratio of maximum tidal discharge amplitude (MTDA) to fluvial discharge. The ratio of MTDA to river discharge scales with bifurcation order. The water level setup created by non-linear tidal and fluvial interactions affects the discharge division at tidal bifurcations. In general, the net tidal impact is to attenuate the inequality in discharge division in the PRD. The tide is non-negligible in the cross-sectional morphology and plays a decisive role in the formation of the river channel in the seaward portion of the delta.
机译:河流液压几何形状(HG)的变化对河流性地貌研究和集水区管理有根本重要性。在潮汐影响的河水中,沟道几何形状显示混合缩放行为,因为通道形成放电是潮汐和河流起源。本研究旨在映射珠江三角洲(PRD)渠道网络中Delta形态的潮汐签名。 2D数值模型的模型结果用于分析河流和潮汐排放的空间变化及其与整个三角洲的代表性信道几何关系。 PRD中分销通道的下游HG具有三个区域的不同特性。形态的过渡点,其将δ分成河流和潮汐主导的部件,与平均流速中的那些相一致,最大潮气放电幅度(MTDA)与河流放电的比率。 MTDA与河流放电的比例具有分叉顺序。非线性潮汐和河流相互作用创建的水位设置会影响潮汐分叉的排放分裂。一般而言,净潮汐影响是损害珠三角排放司的不平等。在横截面形态中,潮汐在横截面形态中是不可忽略的,并且在三角洲的海侧形成河道的形成中起决定性的作用。

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