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首页> 外文期刊>Ocean & coastal management >Recent changes in hydrodynamic characteristics of the Pearl River Delta during the flood period and associated underlying causes
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Recent changes in hydrodynamic characteristics of the Pearl River Delta during the flood period and associated underlying causes

机译：洪水时期珠江三角洲水动力特征的最新变化及其潜在原因。

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It is well-known that both human activities and river-tide dynamics are significant factors affecting the hydrodynamic process in estuarine and coastal regions. In this respect, it is considered that riverbed down-cutting exacerbated by human interventions (such as dam construction, sand excavation, and dredging for navigation) may exert dramatic changes in the hydrodynamic characteristics of the Pearl River Delta (PRD). In this study, changes in the rating curves of residual water level (RWL) versus residual water discharge (RWD) at upstream stations of the PRD are examined between three extreme floods (here termed as "986," "056," and "086," respectively), in addition to variations in RWL along the West, North, and East Rivers. The results show a dramatic downshift of the rating curves (0.65-4.9 m) in "056" and "086", compared with the case in "986". Besides, the RWL along the three tributaries fell significantly at the same RWD and the maximum reduction in the RWL occurred in the East River. It is considered that the main reason for this occurrence could be contributed to uneven deepening of river channels induced by uncontrolled and disorderly human activities. In addition, the decrease in RWL was more significant in the upper reaches than that in the lower reaches, which reduced the RWL slope and enhanced the PRD tidal dynamics. However, compared with the case in "056," the rating curves in "086" are seen to shift up slightly (0.11-0.29 m) and the RWL increased in upstream parts but decreased in downstream parts in the West and North Rivers. This phenomenon can be attributed to the impacts of river-tide dynamics: river flow plays an important role upstream, and the flood wave in "086" delivered more water volume into the PRD for the same range of RWD and raised the RWL, whereas tidal dynamics contributed considerably to the effects downstream and the small tidal range in "086" lowered the RWL. It is anticipated that these results can be used as scientific guidelines for general water management and particularly for flood control in the PRD.
机译：众所周知，人类活动和潮汐动力学都是影响河口和沿海地区水动力过程的重要因素。在这方面，人们认为，人为干预（例如大坝建设，挖砂和疏navigation航行等）加剧了河床的下坡切割，可能会对珠江三角洲（PRD）的水动力特性产生巨大的变化。在这项研究中，在三个极端洪水（这里称为“ 986”，“ 056”和“ 086”）之间，检查了珠三角上游站的残留水位（RWL）与残留水排放（RWD）的额定曲线的变化。 ”），以及沿西部，北部和东部河流的RWL变化。结果表明，与“ 986”相比，“ 056”和“ 086”的额定曲线急剧下降（0.65-4.9 m）。此外，沿三个支流的RWL在相同的RWD时显着下降，并且RWL的最大减少发生在东河。人们认为，发生这种现象的主要原因可能是由于人类不受控制的无序活动引起的河道加深不均匀。另外，上游的RWL的下降比下游的RWL的下降更为显着，这减小了RWL的斜率并增强了PRD的潮汐动力学。但是，与“ 056”的情况相比，“ 086”的等级曲线略有上升（0.11-0.29 m），西部和北部河流上游地区的RWL增加，但下游地区的RWL减少。这种现象可归因于河水潮汐动力学的影响：河水在上游起着重要作用，“ 086”中的洪水波在相同的RWD范围内向PRD输送了更多的水量，并提高了RWL，而潮汐动力学对下游影响做出了很大贡献，“ 086”中的小潮差降低了RWL。可以预期，这些结果可以用作珠三角地区一般水管理，特别是防洪科学指南。

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