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首页> 外文期刊>Hydrological Processes >Modelling wetland connectivity during overbank flooding in a tropical floodplain in north Queensland, Australia
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Modelling wetland connectivity during overbank flooding in a tropical floodplain in north Queensland, Australia

机译：在澳大利亚昆士兰州北部的一个热带洪泛区中，在高洪泛滥期间的湿地连通性建模

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Hydrological connectivity between floodplain wetlands and rivers is one of the principal driving mechanisms for the diversity, productivity and interactions of the major biota in river–floodplain systems. This article describes a method of quantifying flood-induced overbank connectivity using a hydrodynamic model (MIKE 21) to calculate the timing, the duration and the spatial extent of the connections between several floodplain wetlands and rivers in the Tully–Murray catchment, north Queensland, Australia. Areal photogrammetry and field surveyed stream cross data were used to reproduce floodplain topography and rivers in the model. Laser altimetry (LiDAR)–derived fine resolution elevation data, for the central floodplain, were added to the topography model to improve the resolution of key features including wetlands, flow pathways and natural and artificial flow barriers. The hydrodynamic model was calibrated using a combination of in-stream and floodplain gauge records. A range of off-stream wetlands including natural and artificial, small and large were investigated for their connectivity with two main rivers (Tully and Murray) flowing over the floodplain for flood events of 1-, 20- and 50-year recurrence intervals. The duration of the connection of individual wetlands varied from 1 to 12 days, depending on flood magnitude and location in the floodplain, with some wetlands only connected during large floods. All of the wetlands studied were connected to the Tully River for shorter periods than they were to the Murray River because of the higher bank heights and levees on the Tully River and wetland proximity to the Murray River. Other than hydrology, land relief, riverbank elevation and levee banks along the river were found key factors controlling the degree of connectivity. These variations in wetland connectivity could have important implications for aquatic biota that move between rivers and off-stream habitats during floods. Copyright © 2011 John Wiley & Sons, Ltd.
机译：洪泛区湿地和河流之间的水文连通性是河洪平原系统中主要生物群落的多样性，生产力和相互作用的主要驱动机制之一。本文介绍了一种使用水动力模型（MIKE 21）来量化洪水诱发的河岸连通性的方法，以计算昆士兰州北部Tully-Murray流域的几个洪泛区湿地与河流之间的连接时间，持续时间和空间范围，澳大利亚。使用区域摄影测量法和野外调查的河流交叉数据来重现模型中的洪泛区地形和河流。由激光测高仪（LiDAR）导出的，用于洪泛区中心的高分辨率高程数据已添加到地形模型中，以提高关键特征的分辨率，包括湿地，水流通道以及自然和人工水流屏障。水流模型是使用河床和洪泛量表记录的组合进行校准的。对于1年，20年和50年复发间隔的洪水事件，研究了一系列下游湿地，包括自然和人工，小型和大型的湿地与两条主要河流（塔利河和默里河）的连通性，这些河流流过洪泛区。各个湿地的连接持续时间从1到12天不等，具体取决于洪水的大小和在洪泛区中的位置，有些湿地仅在大洪水时才连接。由于塔利河的堤岸高度和堤岸较高，以及湿地靠近墨累河，因此所有研究的湿地与塔利河的连接时间都比与墨累河的连接时间短。除了水文学以外，还发现了沿河的土地救济，河岸高程和堤岸，这是控制连通程度的关键因素。湿地连通性的这些变化可能会对洪水期间在河流和下游生境之间移动的水生生物群产生重要影响。版权所有©2011 John Wiley＆Sons，Ltd.

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