气候变化领域集成服务门户(CCPortal): Impact of hydrological drought occurrence, duration, and severity on Murray-Darling basin water quality

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DOI	10.1016/j.watres.2024.121201
	Impact of hydrological drought occurrence, duration, and severity on Murray-Darling basin water quality
	Athukoralalage, Dilanka; Brookes, Justin; McDowell, Rich W.; Mosley, Luke M.
发表日期	2024
ISSN	0043-1354
EISSN	1879-2448
起始页码	252
卷号	252
英文摘要	The severity and frequency of droughts are projected to increase globally due to climate change, but the effects of this on water quality are uncertain. The Murray -Darling Basin (MDB) is the largest river system in Australia and has been impacted by droughts of varying severity within recent decades. In this study, we assessed the influence of hydrological droughts and their characteristics (severity and duration) on water quality, utilising a long-term (1980-2017) dataset from two monitoring sites. The main drought periods, and their duration and severity, were identified using the calculated Standardised Drought Index values (SDI) from averaged monthly streamflow data. While several hydrological drought periods were identified, the longest duration and greatest severity were during the Millennium Drought (1998-2010). Nutrient loads and concentrations of Total Nitrogen and Total Phosphorus of drought and post -drought periods were significantly different. The drought period showed the lowest median and interquartile range of nutrient (total nitrogen, TN; oxidised nitrogen, NOX; total phosphorus, TP; and soluble reactive phosphorus, SRP) concentrations and loads for both sites, whereas the highest nutrient loads and concentrations were reported during the post -drought period (approx. 1 x 103 to 1 x 105 kg day -1 increase in nutrient loads). Our analysis found significant relationships between nutrient loads and SDI during droughts. The load of N and P in the initial flush post -drought increased with drought at both sites. This suggests that nutrients were retained in the landscape during the drought and released in higher loads post -drought when the catchment became wetter, the hydrology was activated, and nutrients were mobilised. Hydrology is a key driver controlling the water quality within the inter -drought period and the peak nutrient loads post -drought. The duration and the severity of droughts had a significant (p = 0.01) influence on peak TN and TP monthly loads but not cumulative loads over a 12 -month period. Hydrological droughts are important factors in controlling the water quality of the MDB. Therefore, management efforts should be focused on reducing the occurrence and duration of these events, along with the implementation of catchment nutrient control measures.
英文关键词	Hydrological drought; Water quality; Nutrient loads; Standardised drought index
语种	英语
WOS研究方向	Engineering ; Environmental Sciences & Ecology ; Water Resources
WOS类目	Engineering, Environmental ; Environmental Sciences ; Water Resources
WOS记录号	WOS:001182467900001
来源期刊	WATER RESEARCH
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305427
作者单位	University of Adelaide; AgResearch - New Zealand; Lincoln University - New Zealand; University of Adelaide; University of Adelaide
推荐引用方式 GB/T 7714	Athukoralalage, Dilanka,Brookes, Justin,McDowell, Rich W.,et al. Impact of hydrological drought occurrence, duration, and severity on Murray-Darling basin water quality[J],2024,252.
APA	Athukoralalage, Dilanka,Brookes, Justin,McDowell, Rich W.,&Mosley, Luke M..(2024).Impact of hydrological drought occurrence, duration, and severity on Murray-Darling basin water quality.WATER RESEARCH,252.
MLA	Athukoralalage, Dilanka,et al."Impact of hydrological drought occurrence, duration, and severity on Murray-Darling basin water quality".WATER RESEARCH 252(2024).