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首页> 外文期刊>Estuarine Coastal and Shelf Science >Intra-annual variation in turbidity in response to terrestrial runoff on near-shore coral reefs of the Great Barrier Reef
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Intra-annual variation in turbidity in response to terrestrial runoff on near-shore coral reefs of the Great Barrier Reef

机译：大堡礁近岸珊瑚礁对地表径流的浊度年内变化

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Seawater turbidity is a fundamental driver of the ecology of coastal marine systems, and is widely used as indicator for environmental reporting. However, the time scales and processes leading to changes in turbidity in tropical coastal waters remain poorly understood. This study investigates the main determinants of inshore turbidity in four inshore regions along ~ 1000 km of the Australian Great Barrier Reef, based on ~3 years of almost continuous in situ turbidity logger data on 14 reefs. Generalized additive mixed models were used to predict spatial and temporal variation in weekly mean turbidity based on variation in resuspension and runoff conditions. At any given wave height, wave period and tidal range, turbidity was significantly affected by river flow and rainfall. Averaged across all reefs, turbidity was 13% lower (range: 5-37%) in weeks with low compared with high rainfall and river flows. Additionally, turbidity was on average 43% lower 250 days into the dry season than at the start of the dry season on reefs with long-term mean turbidity >1.1 NTU. The data suggest the time scale of winnowing or consolidation of newly imported materials in this zone is months to years. In contrast, turbidity returned to low levels within weeks after river flows and rainfall on reefs with long-term mean turbidity of <1.1 NTU. Turbidity was also up to 10-fold higher on reefs near compared to away from river mouths, suggesting inter-annual accumulation of fine resuspendible sediments. The study suggests that a reduction in the river loads of fine sediments and nutrients through improved land management should lead to measurably improved inshore water clarity in the most turbid parts of the GBR.
机译：海水浊度是沿海海洋系统生态的根本驱动力，被广泛用作环境报告的指标。然而，导致热带沿海水域浊度变化的时间尺度和过程仍然知之甚少。这项研究基于对14个礁石的约3年几乎连续的原位浊度记录仪数据，调查了沿澳大利亚大堡礁约1000 km的四个近海区域的近岸浊度的主要决定因素。基于悬浮和径流条件的变化，使用广义的添加剂混合模型预测每周平均浊度的时空变化。在任何给定的波浪高度，波浪周期和潮汐范围内，浊度都受到河流流量和降雨的显着影响。与高降雨和河流流量相比，在所有珊瑚礁中平均的浊度在几周内降低了13％（范围：5-37％）。此外，对于长期平均浊度> 1.1 NTU的珊瑚礁，进入干旱季节250天的浊度平均比干旱季节开始时低43％。数据表明，在该区域对新进口材料进行风选或合并的时间范围为数月至数年。相反，在河流流量和礁石降雨之后的几周内，浊度恢复到较低水平，长期平均浊度<1.1 NTU。与远离河口相比，附近礁石的浊度也高出10倍，这表明细小可重悬的沉积物在年际积累。该研究表明，通过改善土地管理，减少河流细颗粒沉积物和养分的负荷应可显着改善GBR最浑浊地区的近岸水质清晰度。

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