Streamflow Reconstructions Using Tree-Ring Based Paleo Proxies for the Upper Adige River Basin (Italy)

The Adige River Basin (ARB) provides a vital water supply source for varying demands including agriculture (wine production), energy (hydropower) and municipal water supply. Given the importance of this river system, information about past (paleo) drought and pluvial (wet) periods would quantity risk to water managers and planners. Annual streamflow data were obtained for four gauges that were spatially located within the upper ARB. The Old World Drought Atlas (OWDA) provides an annual June–July–August (JJA) self-calibrating Palmer Drought Severity Index (scPDSI) derived from 106 tree-ring chronologies for 5414 grid points across Europe from 0 to 2012 AD. In lieu of tree-ring chronologies, the OWDA dataset was used as a proxy to reconstruct both individual gauge and ARB regional streamflow from 0 to 2012. Principal component analysis (PCA) was applied to the four ARB streamflow gauges to generate one representative vector of regional streamflow. This regional streamflow vector was highly correlated with the four individual gauges, as coefficient of determination (R2) values ranged from 85% to 96%. Prescreening methods included correlating annual streamflow and scPDSI cells (within a 450 km radius) in which significant (p ≤ 0.01 or 99% significance) scPDSI cells were identified. The significant scPDSI cells were then evaluated for temporal stability to ensure practical and reliable reconstructions. Statistically significant and temporally stable scPDSI cells were used as predictors (independent variables) to reconstruct streamflow (predictand or dependent variable) for both individual gauges and at the regional scale. This resulted in highly skillful reconstructions of upper ARB streamflow from 0 to 2012 AD. Multiple drought and pluvial periods were identified in the paleo record that exceed those observed in the recent, historic record. Moreover, this study concurred with streamflow reconstructions in nearby European watersheds.

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Spatial simulation of water supply service flow in Ningxia, China

10.5194/egusphere-egu2020-20894 ◽

2020 ◽

Author(s):

Jie Xu ◽

Gaodi Xie ◽

Yu Xiao ◽

Jingya Liu ◽

Keyu Qin ◽

...

Keyword(s):

Water Supply ◽

River Basin ◽

Water Conservation ◽

Arid Regions ◽

Yellow River ◽

Source Region ◽

Regional Scale ◽

Tibet Plateau ◽

Residual Water ◽

Semi Arid

Transregional Ecosystem Service (ES) flows are ubiquitous and are receiving more attention in an increasingly metacoupled world. Water has typical flow properties and is a common flow medium of Water-related Ecosystem Services (WES), such as water supply, water conservation, etc. Ningxia is in a transition zone from semi-arid to arid areas of the Yellow River basin of China. Its role in the water transfer from the Qinghai-Tibet Plateau to the downstream city and agriculture is important in allocating the scarce water resources in (semi-)arid regions. This study described the water flow process to/from Ningxia and revealed the supply-demand balance of water in Ningxia and its adjacent basins. On the grid scale, the total dynamic residual water in Ningxia from 2000 to 2015 was 2.20&#215;1012 m3~6.26&#215;1012 m3. However, there was still a dynamic water demand gap of -72.25&#215;108 m3 ~ -59.08&#215;108 m3, which could only be supplemented by manual water intake. At the regional scale, Ningxia had two sides, which was both the beneficiary of the upper Xiaheyan basin, Qingshui River - Kushui River basin, Xiaheyan - Shizuishan basin, Hexi Inland River-Shiyang River basin, Hexi Inland Rive-Hexi desert basin and internal flow area, and the supplier of the downstream Shizuishan - Hekou town, Longmen to Sanmenxia subbasin. As the benefitting district, the total net inflow water supply service in the supply area from 2000 to 2015 was 135.86&#215;108 m3 ~ 294.22&#215;108 m3, among which the non-Ningxia region in the sub-basin above the Xiaheyan basin was the main source region of water supply service in Ningxia. As the supply area, the net outflow volume of water supply service in Ningxia from 2000 to 2015 was 72.83&#215;108 m3~200.46&#215;108 m3, mainly flowing to non-Ningxia regions from Shizuishan to Hekou town. Overall, the net volume of water supply service flowing into Ningxia from 2000 to 2015 ranged from 63.03&#215;108 m3 to 93.76&#215;108 m3. This study can enhance the understanding of trans-boundary telecoupling relationship of WES in Ningxia and contribute to form a foundation for interregional management and allocation of WES in (semi-)arid regions to promote equity in sustainable regional development.

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Beyond annual streamflow reconstructions for the Upper Colorado River Basin: A paleo-water-balance approach

Water Resources Research ◽

10.1002/2015wr017283 ◽

2015 ◽

Vol 51 (12) ◽

pp. 9763-9774 ◽

Cited By ~ 10

Author(s):

Subhrendu Gangopadhyay ◽

Gregory J. McCabe ◽

Connie A. Woodhouse

Keyword(s):

Water Balance ◽

River Basin ◽

Colorado River ◽

Colorado River Basin ◽

Annual Streamflow ◽

Upper Colorado River Basin ◽

Balance Approach ◽

Streamflow Reconstructions

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WATER: THE URGENCY OF A TERRITORIAL AGENDA

Ambiente & sociedade ◽

10.1590/1809-4422asoc0075r1v1942016 ◽

2016 ◽

Vol 19 (4) ◽

pp. 121-136 ◽

Cited By ~ 1

Author(s):

GISELA AQUINO PIRES DO RIO ◽

◽

HELENA RIBEIRO DRUMMOND ◽

CHRISTIAN RICARDO RIBEIRO ◽

◽

...

Keyword(s):

Water Management ◽

Water Supply ◽

Flow Control ◽

Environmental History ◽

River Basin ◽

Metropolitan Areas ◽

Regional Scale ◽

Sao Paulo ◽

Emergency Actions ◽

Paraíba Do Sul River

ABSTRACT This paper presents and discusses the water supply crisis and the resulting risk of rationing in regional scale in the Brazilian Southeast (2014/15). Considering the extension, magnitude and intensity of this crisis, particularly in São Paulo metropolitan areas and throughout Paraíba do Sul river, it is argued that new spatialities are emerging and imposing adjustments to water management. According to this paper, the latter is a question of geo-institutional nature. It is not possible to understand the water supply crisis and emergency actions as exclusively related to flow control and reduction. From this understanding comes the urgency of a territorial agenda, that is, one that considers the relations between different spaces, diverse agents, and the environmental history itself in Paraíba do Sul river basin.

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