气候变化领域集成服务门户(CCPortal): Climate change overtakes coastal engineering as the dominant driver of hydrological change in a large shallow lagoon

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DOI	10.5194/hess-24-5673-2020
	Climate change overtakes coastal engineering as the dominant driver of hydrological change in a large shallow lagoon
	Huang P.; Hennig K.; Kala J.; Andrys J.; Hipsey M.R.
发表日期	2020
ISSN	1027-5606
起始页码	5673
结束页码	5697
卷号	24 期号:11
英文摘要	Ecosystems in shallow micro-Tidal lagoons are particularly sensitive to hydrologic changes. Lagoons are complex transitional ecosystems between land and sea, and the signals of direct human disturbance can be confounded by variability of the climate system, but from an effective estuary management perspective, the effects of climate versus direct human engineering interventions need to be identified separately. This study developed a 3D finite-volume hydrodynamic model to assess changes in hydrodynamics of the Peel Harvey Estuary, a large shallow lagoon with restricted connection with ocean; this was done by considering how attributes such as water retention time, salinity and stratification have responded to a range of factors, focusing on the drying climate trend and the opening of a large artificial channel over the period from 1970 to 2016, and how they will evolve under current climate projections. The results show that the introduction of the artificial channel has fundamentally modified the flushing and mixing within the lagoon, and the drying climate has changed the hydrology by comparable magnitudes to that of the opening of the artificial channel. The results also highlight the complexity of their interacting impacts. Firstly, the artificial channel successfully improved the estuary flushing by reducing average water ages by 20 110 d, while in contrast the reduced precipitation and catchment inflow had a gradual opposite effect on the water ages; during the wet season this has almost counteracted the reduction brought about by the channel. Secondly, the drying climate caused an increase in the salinity of the lagoon by 10 30 PSU (Practical Salinity Unit); whilst the artificial channel increased the salinity during the wet season, it has reduced the likelihood of hypersalinity (40 PSU) during the dry season in some areas. The opening of the artificial channel was also shown to increase the seawater fluxes and salinity stratification, while the drying climate acted to reduce the salinity stratification in the main body of the estuary. The impacts also varied spatially in this large lagoon. The southern estuary, which has the least connection with the ocean through the natural channel, is the most sensitive to climate change and the opening of the artificial channel. The projected future drying climate is shown to slightly increase the retention time and salinity in the lagoon and increase the hypersalinity risk in the rivers. The significance of these changes for nutrient retention and estuary ecology are discussed, highlighting the importance of these factors when setting up monitoring programmes, environmental flow strategies and nutrient load reduction targets. © 2020 BMJ Publishing Group. All rights reserved.
语种	英语
scopus关键词	Catchments; Climate models; Coastal engineering; Drying; Ecosystems; Estuaries; Human engineering; Hydrodynamics; Lakes; Nutrients; Climate projection; Environmental flow; Human disturbances; Hydrodynamic model; Hydrologic changes; Hydrological changes; Monitoring programmes; Salinity stratification; Climate change; catchment; climate change; coastal engineering; coastal lagoon; dry season; estuary; hydrodynamics; hydrological regime; sea surface salinity; shallow water; stratification; Australia; Harvey Estuary; Peel Inlet; Western Australia
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159247
作者单位	Huang, P., Aquatic Ecodynamics, Uwa School of Agriculture and Environment, University of Western Australia, Crawley, WA 6009, Australia, Uwa Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia; Hennig, K., Water Science Branch, Department of Water and Environmental Regulation, Perth, WA 6842, Australia; Kala, J., Environmental and Conservation Sciences, Murdoch University, Murdoch, WA 6015, Australia; Andrys, J., Environmental and Conservation Sciences, Murdoch University, Murdoch, WA 6015, Australia; Hipsey, M.R., Aquatic Ecodynamics, Uwa School of Agriculture and Environment, University of Western Australia, Crawley, WA 6009, Australia, Uwa Oceans Institute, University of Western Australia, Crawley, WA 6009, Australia
推荐引用方式 GB/T 7714	Huang P.,Hennig K.,Kala J.,et al. Climate change overtakes coastal engineering as the dominant driver of hydrological change in a large shallow lagoon[J],2020,24(11).
APA	Huang P.,Hennig K.,Kala J.,Andrys J.,&Hipsey M.R..(2020).Climate change overtakes coastal engineering as the dominant driver of hydrological change in a large shallow lagoon.Hydrology and Earth System Sciences,24(11).
MLA	Huang P.,et al."Climate change overtakes coastal engineering as the dominant driver of hydrological change in a large shallow lagoon".Hydrology and Earth System Sciences 24.11(2020).