磨刀门航道整治工程对咸潮上溯的影响

采用实测水文资料建立高精度的三维水流盐度数学模型,模拟了磨刀门航道整治工程前后流场及盐水入侵的变化.并运用已验证好的磨刀门高精度三维水流盐度数学模型,计算了磨刀门航道整治工程前后水动力变化及咸潮上溯程度,为航道整治工程的实施提供依据.研究表明航道整治工程使得近海地区的盐度值有所增大,加剧了咸潮上溯程度,但工程对咸潮上溯的影响不大,不是珠江三角洲地区近年来咸潮上溯的主要原因.

Impact of waterway regulation engineering on saltwater intrusion in Modaomen estuary

This paper analyses measured Modaomen hydrological data and exhibits the temporal and spatial distribution of salinity and characteristics of fresh and salinity water mixing, as well as the correlation between salinity, water level and suspended sediment concentration in the Modaomen region. Based on the establishment of high-precision three-dimensional salinity mathematical model in Modaomen region, this paper calculates various engineering plans and examines the changes of flow field and tidal saltwater intrusion, which provides elementary base for implementation of the waterway regulation engineering. The study indicates that the salinity degree has a merely minor increase after projects indeed in the estuary to provide situation for tide intrusion. However, the influence is little and it fails to be the chief reasons for the depravation of tide intrusion in the Modaomen estuary recent years.