Can PDSI inform extreme precipitation?: An exploration with a 500 year long paleoclimate reconstruction over the U.S.

Ho, Michelle; Cook, Edward R.; Lall, Upmanu

doi:10.1002/2016wr018712

Cited by 31 publications

(31 citation statements)

References 85 publications

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“…Alternatively, statistically-based models, such as regression and correlation models, are observation-oriented methods that seek to find functional relationships between explanatory and response variables (Elsanabary & Gan, 2015;Kwon, Brown, Xu, & Lall, 2009;Steinschneider, Ho, Cook, & Lall, 2016). These models are data orientated and do not explicitly consider the process driving the hydrological system.…”

Section: Introductionmentioning

confidence: 99%

The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

Hao

et al. 2019

Hydrological Processes

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The Three Gorges Dam is the world's largest capacity hydropower station located in the Hubei province along the Yangtze River in China, which began operations in 2003. The dam also functions to store and regulate the downstream releases of water in order to provide flood control and navigational support in addition to hydropower generation. Flow regulation is particularly important for alleviating the impacts of low-and high-flow events during the summer rainy season (June, July, and August). The impact of dam operations on summer flows is the focus of this work. Naturalized flows are modelled using a canonical correlation analysis and covariates of subbasin-scale precipitation resulting in good model skill with an average correlation of 0.92. The model is then used to estimate natural flows in the period after dam operation. A comparison between modelled and gauged streamflow post 2003 is made and the impact of the dam on downstream flow is assessed. Streamflow variability is found to be strongly related to rainfall variability. An analysis of regional streamflow variability across the Yangtze River Basin showed a mode of spatially negatively correlated variability between the upper and lower basin areas. The Three Gorges Dam likely mitigated the occurrence of high-flow events at Yichang station located near the dam. However, the high flow at the remaining stations in the lower reach is not noticeably alleviated due to the diminishing influence of the dam on distant downstream flows and the impact of the lakes downstream of the dam that act to attenuate flows. Three types of flow regime changes between naturalized and observed flows were defined and used to assess the changes in the occurrence of high-and low-flow events resulting from dam operations. K E Y W O R D S canonical correlation analysis, high flow, low flow, Three Gorges Dam

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Section: Introductionmentioning

confidence: 99%

The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

Hao

et al. 2019

Hydrological Processes

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“…In addition to water release or transfer from the dams, the design also has to integrate the analysis results from climatic data and hydrological records, such as streamflow information [98]. The hydrologic data from the dam need to be collected during the anomalously dry period, which has never been done before, and monitored the whole time, especially with the occurrence of catastrophic droughts and floods that are larger than events considered in the design scopes for the existing dams.…”

Section: Resultsmentioning

confidence: 99%

Impact of Extreme Drought Climate on Water Security in North Borneo: Case Study of Sabah

Payus

Huey

Adnan

et al. 2020

Water

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For countries in Southeast Asia that mainly rely on surface water as their water resource, changes in weather patterns and hydrological systems due to climate change will cause severely decreased water resource availability. Warm weather triggers more water use and exacerbates the extraction of water resources, which will change the operation patterns of water usage and increase demand, resulting in water scarcity. The occurrence of prolonged drought upsets the balance between water supply and demand, significantly increasing the vulnerability of regions to damaging impacts. The objectives of this study are to identify trends and determine the impacts of extreme drought events on water levels for the major important water dams in the northern part of Borneo, and to assess the risk of water insecurity for the dams. In this context, remote sensing images are used to determine the degree of risk of water insecurity in the regions. Statistical methods are used in the analysis of daily water levels and rainfall data. The findings show that water levels in dams on the North and Northeast Coasts of Borneo are greatly affected by the extreme drought climate caused by the Northeast Monsoon, with mild to the high risk recorded in terms of water insecurity, with only two of the water dams being water-secure. This study shows how climate change has affected water availability throughout the regions.

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“…Paleoclimatic reconstructions of hydroclimatic variables have been introduced into hydrology to describe streamflow (Schook et al 2016;Ho et al 2016Ho et al , 2017, floods (Benito et al 2004), average (Ho et al 2015a,b) or extreme rainfall (Steinschneider et al 2016) and drought (Cook et al 2004(Cook et al , 2015. Except for a number of regional studies, e.g., for British Isles (Spraggs et al 2015) or France (Caillouet et al 2017), reconstructions often focus on meteorological drought.…”

Section: Methodsmentioning

confidence: 99%

Representation of European hydroclimatic patterns with self-organizing maps

Markonis

Strnad

2020

The Holocene

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Self-organizing maps provide a powerful, non-linear technique of dimensionality reduction that can be used to identify clusters with similar attributes. Here, they were constructed from a 1000-year-long gridded palaeoclimatic dataset, namely the Old World Drought Atlas, to detect regions of homogeneous hydroclimatic variability across the European continent. A classification scheme of 10 regions was found to describe most efficiently the spatial properties of Europe’s hydroclimate. These regions were mainly divided into a northern and a southern subset, linked together with a northwest-to-southeast orientation. Further analysis of the classification scheme with complex networks confirmed the divergence between the northern and southern components of European hydroclimate, also revealing that is not strongly correlated to the Iberian Peninsula. On the contrary, the region covering the British Isles, France and Germany appeared to be linked to both branches, implying links of hydroclimate with atmospheric/oceanic circulation.

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Can PDSI inform extreme precipitation?: An exploration with a 500 year long paleoclimate reconstruction over the U.S.

Cited by 31 publications

References 85 publications

The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

Impact of Extreme Drought Climate on Water Security in North Borneo: Case Study of Sabah

Representation of European hydroclimatic patterns with self-organizing maps

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