Hydrological cycle, Mediterranean basins hydrology

Allam, Antoine; Moussa, Roger; Najem, W.; Bocquillon, Claude

doi:10.1016/b978-0-12-818086-0.00001-7

Cited by 6 publications

(9 citation statements)

References 37 publications

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“…Hydrograph quantification and time‐series analysis elicit a better understanding of the flow and flood dynamics of rivers and catchments for use in river management and flood risk management planning at catchment and regional scales (Allam et al, 2020; Bracken, 2013; Brunner et al, 2018; Hannah et al, 2000; Laudon et al, 2002; Parajka et al, 2013). This study has shown that analysis of changes in hydrograph shape at‐a‐station and from upstream‐to‐downstream can reveal important temporal information about changes in flow hydrology for in‐channel fresh, high flow and overbank flood types.…”

Section: Discussionmentioning

confidence: 99%

“…In general, the flow mitigation signal for overbank floods is higher than for in-channel and high flows effects in the Central River Region (Hastings, Manning, Hunter and Hawkesbury), whereas the overbank flood mitigation signal of some catchments in the Northern Rivers Region (Brunswick, Richmond, Clarence, Bellinger and Macleay) is lower compared to in-channel and high flow mitigation signals in these catchments. The overbank flood mitigation signal of the Tuross, Bega, Tweed and Karuah River catchments is at the moderate level across all flow types.4 | DISCUSSION 4.1 | Usefulness of hydrographs for analysis of flood hydrology changeHydrograph quantification and time-series analysis elicit a better understanding of the flow and flood dynamics of rivers and catchments for use in river management and flood risk management planning at catchment and regional scales(Allam et al, 2020;Bracken, 2013;Brunner et al, 2018;Hannah et al, 2000…”

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confidence: 99%

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Detection of decadal time‐series changes in flow hydrology in eastern Australia: Considerations for river recovery and flood management

Arash,

Fryirs,

Ralph

2023

Earth Surf Processes Landf

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Since European colonisation, many coastal rivers of New South Wales (NSW) have been highly modified by channelisation, flow regulation, sediment mining, intensive grazing and agriculture, deforestation, and riparian vegetation and wood removal. Since the late 1980s, nearly 55% of these rivers have undergone a significant ‘re‐greening’ and geomorphic recovery with changes to instream and riparian roughness. However, little research has been undertaken to quantify if there have been any coeval changes in flow hydrology. Approximately 7000 flow hydrographs with one‐hour time‐steps from 117 gauges on 45 study rivers (17 of 20 coastal catchments of NSW) were used to assess changes to in‐channel and overbank hydrology over decadal timeframes. Hydrograph shape and attenuation characteristics for three morphologically defined flow stages were analysed: in‐channel fresh, high flow and overbank flood. Time‐series analysis was used to quantify changes in flow hydrology from the early‐20th century to present and identify trends occurring between known degradation phases (1910s–1940s and 1940s–1980s) and a recovery phase (1990s to present) for these rivers. Our findings indicate that, on average, and for some key examples, changes in flow hydrology are occurring. Flows are slowing and attenuating as indicated by decreases in flood wave celerity and hydrograph kurtosis, skewness and rate of rise and increases in peak‐to‐peak travel time, flood peak attenuation and flood wave attenuation index. The most significant changes have occurred since the 1980s with the most noticeable effects on the behaviour of high flows (around the bankfull stage). However, there is not a consistent direction change in these indicators in all places. We use these findings to categorise the flow mitigation signal of the study regions and catchments and discuss the implication for river and flood management.

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Detection of decadal time‐series changes in flow hydrology in eastern Australia: Considerations for river recovery and flood management

Arash,

Fryirs,

Ralph

2023

Earth Surf Processes Landf

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“…Summers in the Mediterranean are hot and dry, while winters are wet and cool (Criado-Aldeanueva and Soto-Navarro, 2020). The Mediterranean is also known for its distinctive regional features, which include strong seasonal temperature and precipitation contrasts, strong wind systems, heavy precipitation, and Mediterranean cyclones (Lionello et al, 2006;Nadia et al, 2006;Allam et al, 2020). The Mediterranean Sea is considered a hotspot of climate change (Skliris et al, 2012;Pastor et al, 2020;Soukissian and Sotiriou, 2022).…”

Section: Introductionmentioning

confidence: 99%

Marine heatwaves characteristics in the Mediterranean Sea: Case study the 2019 heatwave events

Hamdeno

Alvera‐Azcárate

2023

Front. Mar. Sci.

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Marine Heatwaves (MHWs) are considered one of the main consequences of global warming. MHWs negatively affect ecosystems, threaten economies, and intensify storms. In this work, we investigated the main characteristics of MHWs in the Mediterranean Sea from 1982 to 2020 and examined the relationship between their frequency and teleconnection patterns (e.g., East Atlantic Pattern (EAP) and East Atlantic/Western Russian Pattern (EATL/WRUS)). We then focused on the most intense MHW events that occurred in 2019 in the western Mediterranean Sea (WMB) and eastern Mediterranean Sea (EMB) by examining the link between the SST anomaly (SSTA) and various atmospheric forcings during these events. Our results showed that MHWs were more frequent and intense in the WMB than in the EMB on temporal and spatial scales, while the duration of MHWs was longer in the EMB. The trend of MHW frequency and duration in the Mediterranean Sea between 1982 and 2020 was about 1.3 ± 0.25 events/decade and 3.6 ± 1.16 days/decade, respectively. More than half of all MHW events in the Mediterranean Sea were recorded in the last decade (2011-2020). The results also showed that the EAP plays an important role in modulating MHW frequency in the Mediterranean Sea, with a strong positive correlation of 0.74, while the EATL/WRUS was strongly negatively correlated with MHW frequency in the EMB, with a correlation of about -0.60. In 2019, six MHW events were observed in the WMB, three of which were classified as strong events (SST exceeded two times the climatological threshold), while two events were detected and classified as strong events in the EMB. In the WMB, the 2019 MHWs extended to a depth of about 20 meters into the water column, while the MHWs in the EMB extended to greater depths of over 50 meters. The strong MHW events in the WMB were associated with a large positive heat flux anomaly and a shallow mixed layer. In the EMB, the high SSTA associated with MHW events caused heat loss from the ocean to the atmosphere and was associated with a shallow mixed layer and anomalously low mean sea level pressure. Finally, a negative relationship between the SSTA and surface Chl-a concentrations was observed during the 2019 MHW events. This negative influence of MHWs on Chl-a was more pronounced in the WMB than in the EMB, suggesting that the WMB MHW events were intense enough to infer a response to chlorophyll-a concentrations.

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“…Nearly one-third of the Mediterranean population is concentrated along its coastal regions. In addition, about 250 million people live in coastal hydrological basins, increasing environmental pressures (EEA 2015;Allam et al 2020). In addition, groundwater resources are the main source of water supply in several Mediterranean countries and are subject to anthropogenic pressures resulting from unequal distribution, uneven accessibility and quality issues (García-Ruiz et al 2011;Calvache et al 2018;Fader et al 2020).…”

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confidence: 99%

“…The Mediterranean and surrounding areas are considered a biogeographic region directly impacted by climate change and associated hydrological hazards and other humaninduced environmental risks (e.g., Döll 2009;García-Ruiz et al 2011;Milano et al 2013;Leduc et al 2017;Calvache et al 2018;Cramer et al 2018;Allam et al 2020;Schilling et al 2020, and references therein). Furthermore, according to UN-Water (2021), climate change is expected to increase seasonal variability, creating a more erratic and uncertain water supply.…”

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Hydrogeoethics in sustainable water resources management facing water scarcity in Mediterranean and surrounding regions

et al. 2021

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Hydrological cycle, Mediterranean basins hydrology

Cited by 6 publications

References 37 publications

Detection of decadal time‐series changes in flow hydrology in eastern Australia: Considerations for river recovery and flood management

Detection of decadal time‐series changes in flow hydrology in eastern Australia: Considerations for river recovery and flood management

Marine heatwaves characteristics in the Mediterranean Sea: Case study the 2019 heatwave events

Hydrogeoethics in sustainable water resources management facing water scarcity in Mediterranean and surrounding regions

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