A model to evaluate spatiotemporal variations of hydrological connectivity on a basin-scale complex river network with intensive human activity

Shao, Xiaojing; Fang, Yu; Cui, Baoshan

doi:10.1016/j.scitotenv.2020.138051

Cited by 40 publications

(16 citation statements)

References 44 publications

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“…Nonetheless, some authors recognize the impact that other anthropogenic activities can have on precipitations due to: (1) aerosol emissions (Bai et al, 2020), 2greenhouse emissions and (3) land use (Umar et al, 2019). Additionally, there is a significant support to the view that different human activities (particularly land use and dam constructions) may alter the hydrological cycle at a basin scale (Awotwi et al, 2017;Elsanabary and Gan., 2015;Shao et al, 2020;Van der Ent, 2010;Wang et al, 2008).…”

Section: Salar De Atacama' Hydrological Cyclementioning

confidence: 99%

Role of Lithium Mining on the Water Stress of the Salar De Atacama Basin

Guzmán¹,

Faúndez²,

Jara³

et al. 2021

Preprint

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Brines located in the Salar de Atacama are a significant source of lithium worldwide. The extractive method for these minerals is through brine pumping, with subsequent solar evaporation in ponds. In this latter process, part of the water present in brine is evaporated to the atmosphere, leading to the possibility of harvesting lithium and potassium salts. This situation has risen a series of environmental concerns among local stakeholders and international environmental groups; specifically, in terms of water depletion caused by mining activities. However, no comprehensive studies have been carried out to quantify the impact on the water availability of this basin as a consequence of lithium mining. The aim of this study is to contribute to fill in this gap by quantifying the impact of brine and water evaporation over the precipitations in the area, and thus on the water stress at the Salar de Atacama basin. Through the implementation of a novel methodology based on a VAR model, the potential recharge on the basin is estimated, considering the precipitations associated with water evaporation in the process of lithium extraction. With this information, the Water Stress Index (WSI) over the period 2002-2017 is computed. The results show that

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Section: Salar De Atacama' Hydrological Cyclementioning

confidence: 99%

Role of Lithium Mining on the Water Stress of the Salar De Atacama Basin

Guzmán¹,

Faúndez²,

Jara³

et al. 2021

Preprint

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show abstract

“…In order to support the improvement of urban water security, it is necessary to assess the influence of river network connectivity on water security. Several researchers used assessment indexes to evaluate river network connectivity and water security (Cote et al, 2009;Xu et al, 2012;Deng et al, 2018;Deng, 2019;Garbin et al, 2019;Shao et al, 2020;Gao et al, 2022). Cui et al (2009) used the connectivity index γ and the circuitry index α, which are based on the graph theory, to analyze natural and designed channel networks and assess the impact of their optimization on flood control in Xiaoqinghe River Basin in China.…”

Section: Introductionmentioning

confidence: 99%

Continuous assessment of the adaptability between river network connectivity and water security in a typical highly urbanized area in eastern China

Wang

et al. 2022

Front. Environ. Sci.

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Urbanization has reduced river network connectivity, posing a great threat to water security. However, the mechanism through which changes in river network connectivity impact water security remains uncertain. River network connectivity and water security have been separately and thoroughly assessed by several researchers; however, few studies conducted a coupled assessment of these two aspects together, which may shed light on this mechanism. Based on assessment indicators developed in previous studies and key influence factors identified in the study area, this study proposed a comprehensive evaluation method to continually evaluate the adaptability between river network connectivity and water security in the Wuchengxiyu region, a highly urbanized area in Eastern China. The continuous evaluation was conducted for the period 2010–2019 based on the coupling coordination degree calculation formula. The results show that from 2010 to 2015, the coupling coordination degree between river network connectivity and water security followed a downward trend, due to the uncoordinated development between water systems and urbanization. After 2015, an increasing trend was observed with the implementation of environmental policies. In the past decade, the water surface rate and the coverage rate of suitable flow velocity decreased from 4.59% to 4.28% and from 54.1% to 30.9%, respectively, which may have negative effects on water quality and limit the improvement of regional flood control capacity. Moreover, the evaluation results also prove that policies such as the Ecological River–Lake Construction and the River Chief System have contributed to improve the quality of the water environment and regional flood control. The proposed assessment framework can be used as a guidance to evaluate the relationship between water network connectivity and water security; moreover, it provides new ideas for water network system protection and water quality maintenance in similar highly urbanized areas.

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“…Song et al (2019) concluded that the anthropogenic influence on river network structure is more significant than those of morphology and lithology in the urbanized regions by evaluating the river network change and its multifractal dynamics in the Yangtze River Delta [33]. River networks have become increasingly degraded, altered, or modified by anthropogenic actions such as road and reservoir construction [34]. Urban expansion has exerted dramatic changes in structural or developmental processes in approximately 60% of rivers worldwide [35].…”

Section: Introductionmentioning

confidence: 99%

Setting the Flow Accumulation Threshold Based on Environmental and Morphologic Features to Extract River Networks from Digital Elevation Models

Zhang

Loáiciga

Liao

et al. 2021

IJGI

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Determining the flow accumulation threshold (FAT) is a key task in the extraction of river networks from digital elevation models (DEMs). Several methods have been developed to extract river networks from Digital Elevation Models. However, few studies have considered the geomorphologic complexity in the FAT estimation and river network extraction. Recent studies estimated influencing factors’ impacts on the river length or drainage density without considering anthropogenic impacts and landscape patterns. This study contributes two FAT estimation methods. The first method explores the statistical association between FAT and 47 tentative explanatory factors. Specifically, multi-source data, including meteorologic, vegetation, anthropogenic, landscape, lithology, and topologic characteristics are incorporated into a drainage density-FAT model in basins with complex topographic and environmental characteristics. Non-negative matrix factorization (NMF) was employed to evaluate the factors’ predictive performance. The second method exploits fractal geometry theory to estimate the FAT at the regional scale, that is, in basins whose large areal extent precludes the use of basin-wide representative regression predictors. This paper’s methodology is applied to data acquired for Hubei and Qinghai Provinces, China, from 2001 through 2018 and systematically tested with visual and statistical criteria. Our results reveal key local features useful for river network extraction within the context of complex geomorphologic characteristics at relatively small spatial scales and establish the importance of properly choosing explanatory geomorphologic characteristics in river network extraction. The multifractal method exhibits more accurate extracting results than the box-counting method at the regional scale.

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A model to evaluate spatiotemporal variations of hydrological connectivity on a basin-scale complex river network with intensive human activity

Cited by 40 publications

References 44 publications

Role of Lithium Mining on the Water Stress of the Salar De Atacama Basin

Role of Lithium Mining on the Water Stress of the Salar De Atacama Basin

Continuous assessment of the adaptability between river network connectivity and water security in a typical highly urbanized area in eastern China

Setting the Flow Accumulation Threshold Based on Environmental and Morphologic Features to Extract River Networks from Digital Elevation Models

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