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  1. Article: A Spatial and Temporal Study of the Green and Blue Water Flow Distribution in Typical Ecosystems and its Ecosystem Services Function in an Arid Basin

    Zang, Chuanfu / Mao, Ganquan

    Water. 2019 Jan. 08, v. 11, no. 1

    2019  

    Abstract: Research on relationship between green and blue water flow and ecosystem service functions has great significance for improving water resources management and for ecological protection. In this study, the distribution patterns and service functions of ... ...

    Abstract Research on relationship between green and blue water flow and ecosystem service functions has great significance for improving water resources management and for ecological protection. In this study, the distribution patterns and service functions of green and blue water flow in different ecosystems were analysed by Soil and Water Assessment Tool (SWAT) model simulation and Correlational Analysis. In the entire basin, the amount of green and blue water flow in the grassland was greater than that in the cropland, and that in the cropland was larger than that in the forest. The corn yield per hectare of cropland was highest in the Heihe River Basin, followed by wheat, and the lowest yield was the oil yield from 2000 to 2010. The mutton yield in the grassland ecosystem was greater than the beef yield from 2000 to 2010, which shows that the beef production would consume more water flow. Results show an obvious positive correlation between green or blue water flow and wheat and corn yields. Beef and mutton had a significant correlation with blue water flow, whereas mutton had a stronger correlation with green water flow.
    Keywords basins ; beef ; beef production ; corn ; crop yield ; cropland ; ecosystem services ; ecosystems ; forests ; grasslands ; mutton ; oils ; simulation models ; Soil and Water Assessment Tool model ; water flow ; water management ; watersheds ; wheat
    Language English
    Dates of publication 2019-0108
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2521238-2
    ISSN 2073-4441
    ISSN 2073-4441
    DOI 10.3390/w11010097
    Database NAL-Catalogue (AGRICOLA)

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  2. Article: Undermined co-benefits of hydropower and irrigation under climate change

    Meng, Ying / Liu, Junguo / Wang, Zifeng / Mao, Ganquan / Wang, Kai / Yang, Hong

    Resources, conservation, and recycling. 2021 Apr., v. 167

    2021  

    Abstract: Dam construction is mostly aimed for multiple functions, including irrigation water provision, hydropower, and some others that bring substantial social benefits. However, global warming impacts on the interaction of the positive outcomes of damming ... ...

    Abstract Dam construction is mostly aimed for multiple functions, including irrigation water provision, hydropower, and some others that bring substantial social benefits. However, global warming impacts on the interaction of the positive outcomes of damming remain little known, particularly in terms of the sustainability of their co-benefits, whereby investigating the different impacts of global warming scenarios of 1.5 °C and 2 °C has been a hotspot in water resources and energy research worldwide. This study used an integrative analysis based on a hydrological, techno-economic and agricultural modeling framework to evaluate the effects of global warming scenarios of 1.5 °C and 2 °C on the co-benefits between hydropower and irrigation in the Mekong River basin. The results show the declined hydropower generation and irrigation water supply in the Mekong River basin under 1.5 °C and 2 °C warming scenarios. The co-benefits between the hydropower and the irrigation is more undermined by the global warming of 2 °C relative to 1.5 °C in the Mekong River basin. Moreover, the changes of co-benefits are sensitive to the consideration of the protected areas in the basin. With the consideration of the protected areas, the co-benefits would be enhanced by 2 °C global warming compared to 1.5 °C global warming. Therefore, it is critical for decision-makers to consider the tradeoffs between the environment and dam construction for ensuring energy and food security under global warming scenarios.
    Keywords basins ; decision making ; energy ; food security ; irrigation ; irrigation water ; water power ; water supply ; watersheds ; Mekong River
    Language English
    Dates of publication 2021-04
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1498716-8
    ISSN 0921-3449
    ISSN 0921-3449
    DOI 10.1016/j.resconrec.2020.105375
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Environmental Sustainability of Water Footprint in Mainland China

    Liu, Junguo / Zhao, Dandan / Mao, Ganquan / Cui, Wenhui / Chen, He / Yang, Hong

    Geography and sustainability. 2020 Mar., v. 1, no. 1

    2020  

    Abstract: Water footprint (WF) measures human appropriation of water resources for consumptive use of surface and ground water (blue WF) and soil water (green WF) and for assimilating polluted water (grey WF). Questions have been often asked about the exact ... ...

    Abstract Water footprint (WF) measures human appropriation of water resources for consumptive use of surface and ground water (blue WF) and soil water (green WF) and for assimilating polluted water (grey WF). Questions have been often asked about the exact meaning behind the numbers from WF accounting. However, to date environmental sustainability of WF has never been assessed at the sub-national level over time. This study evaluated the environmental sustainability of blue, green and grey WF for China's 31 mainland provinces in 2002, 2007 and 2012, and identified the unsustainable hotspots. Overall, the total WF increased by 30% between 2002 and 2012. The growth can be attributed to the increase of grey WF because the green and blue WF showed only a slight rise. Among all provinces investigated in 2012, eleven showed unsustainable blue WF (sustainability index SI<0), which were mainly located in the North China Plain. There were 12 provinces that displayed unsustainable green WF, and they were distributed in China's southern and southeastern areas. The grey WF was not sustainable in approximately two third of provinces (19), which were mainly located in China's middle and northern regions and Guangdong province. More than half of China's provinces showed trends of improved SI of green and blue WF from 2002 to 2012. However, the SI of grey WF decreased in almost two third of provinces. Poor levels of WF sustainability were due to water scarcity and pollution, which intensify the degradation of local rivers and ecosystems and make restoration more difficult. The results shed light on the policy making needed to improve sustainable water management, and ecological restoration of hotspot regions.
    Keywords accounting ; degradation ; ecological restoration ; ecosystems ; geography ; groundwater ; humans ; issues and policy ; light ; rivers ; soil water ; water footprint ; water management ; water pollution ; water shortages ; China
    Language English
    Dates of publication 2020-03
    Size p. 8-17.
    Publishing place Elsevier B.V.
    Document type Article
    Note NAL-light
    ISSN 2666-6839
    DOI 10.1016/j.geosus.2020.02.002
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Multidecadal variability of the Tonle Sap Lake flood pulse regime

    Chen, Aifang / Liu, Junguo / Kummu, Matti / Varis, Olli / Tang, Qiuhong / Mao, Ganquan / Wang, Jie / Chen, Deliang

    Hydrological processes. 2021 Sept., v. 35, no. 9

    2021  

    Abstract: Tonle Sap Lake (TSL) is one of the world's most productive lacustrine ecosystems, driven by the Mekong River's seasonal flood pulse. This flood pulse and its long‐term dynamics under the Mekong River basin's (MRB) fast socio‐economic development and ... ...

    Abstract Tonle Sap Lake (TSL) is one of the world's most productive lacustrine ecosystems, driven by the Mekong River's seasonal flood pulse. This flood pulse and its long‐term dynamics under the Mekong River basin's (MRB) fast socio‐economic development and climate change need to be identified and understood. However, existing studies fall short of sufficient time coverage or concentrate only on changes in water level (WL) that is only one of the critical flood pulse parameters influencing the flood pulse ecosystem productivity. Considering the rapidly changing hydroclimatic conditions in the Mekong basin, it is crucial to systematically analyse the changes in multiple key flood pulse parameters. Here, we aim to do that by using observed WL data for 1960–2019 accompanied with several parameters derived from a Digital Bathymetry Model. Results show significant declines of WL and inundation area from the late 1990s in the dry season and for the whole year, on top of increased subdecadal variability. Decreasing (increasing) probabilities of high (low) inundation area for 2000–2019 have been found, in comparison to the return period of inundation area for 1986–2000 (1960–1986). The mean seasonal cycle of daily WL in dry (wet) season for 2000–2019, compared to that for 1986–2000, has shifted by 10 (5) days. Significant correlations and coherence changes between the WL and large‐scale circulations (i.e., El Niño‐Southern Oscillation (ENSO), Pacific Decadal Oscillation (PDO) and Indian Ocean Dipole (IOD)), indicate that the atmospheric circulations could have influenced the flood pulse in different time scales. Also, the changes in discharge at the Mekong mainstream suggest that anthropogenic drivers may have impacted the high water levels in the lake. Overall, our results indicate a declining flood pulse since the late 1990s.
    Keywords basins ; climate change ; dry season ; ecosystems ; hydrology ; lakes ; models ; seasonal variation ; socioeconomic development ; watersheds ; Indian Ocean ; Mekong River
    Language English
    Dates of publication 2021-09
    Publishing place John Wiley & Sons, Inc.
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 1479953-4
    ISSN 1099-1085 ; 0885-6087
    ISSN (online) 1099-1085
    ISSN 0885-6087
    DOI 10.1002/hyp.14327
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Understanding the impacts of climate change and socio-economic development through food-energy-water nexus: A case study of mekong river delta

    Wang, Kai / Liu, Junguo / Xia, Jun / Wang, Zifeng / Meng, Ying / Chen, He / Mao, Ganquan / Ye, Bin

    Resources, conservation, and recycling. 2021 Apr., v. 167

    2021  

    Abstract: Food, energy, and water (FEW) resources are critical concerns to achieve long-term sustainability. Climate change and socio-economic development both affect the FEW Nexus, but the combined impacts of these two factors on a Nexus system is not well ... ...

    Abstract Food, energy, and water (FEW) resources are critical concerns to achieve long-term sustainability. Climate change and socio-economic development both affect the FEW Nexus, but the combined impacts of these two factors on a Nexus system is not well understood. An integrated management model was applied to quantify the combined impacts on the FEW Nexus through rice yield, power generation, and water withdrawal. Five scenarios from the Coupled Model Intercomparison Project Phase 6 were chosen as the inputs of the integrated model in the Mekong River Delta (MRD). Results showed that rice yields will be vulnerable to extreme climate events. The minimum autumn rice yield, 4.7 ton/ha in 2023 under the SSP1–2.6 scenario, will be as low as the yield of the 2016 drought year (4.6 ton/ha). Power generation will increase sharply due to socio-economic development. The power generation of SSP5–8.5 in 2050 will be about 10 times higher than that in 2010. The average total water withdrawal in 2050 was estimated to increase by 40% compared to that in the 2016 drought year and will be more than 3 times higher than the average withdrawal of 1995–2010. Nexus analysis found water is a central resource that connects food and energy sectors in MRD. Regional sustainability analysis showed that climate change and socio-economic development both have a significant impact through affecting the FEW Nexus. Specifically, the energy and water sectors will be more vulnerable to the combined impacts than the food sector due to the coal-fired power plants planned in the MRD.
    Keywords autumn ; case studies ; climate ; climate change ; coal ; drought ; energy ; food industry ; models ; power generation ; rice ; river deltas ; socioeconomic development ; Mekong River
    Language English
    Dates of publication 2021-04
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1498716-8
    ISSN 0921-3449
    ISSN 0921-3449
    DOI 10.1016/j.resconrec.2020.105390
    Database NAL-Catalogue (AGRICOLA)

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  6. Article ; Online: Multi-model analysis of historical runoff changes in the Lancang-Mekong River Basin - Characteristics and uncertainties

    Li, Yuxin / Chen, Aifang / Mao, Ganquan / Chen, Penghan / Huang, Hao / Yang, Hong / Wang, Zifeng / Wang, Kai / Chen, He / Meng, Ying / Zhong, Rui / Wang, Pengfei / Wang, Hong / Liu, Junguo

    Journal of Hydrology. 2023 Apr., v. 619 p.129297-

    2023  

    Abstract: Runoff changes are critical to the sustainable water resource in the Lancang-Mekong River Basin (LMRB). Changes in the LMRB's runoff over the past decades are unclear because of inadequate streamflow observations. The advancement of global hydrological ... ...

    Abstract Runoff changes are critical to the sustainable water resource in the Lancang-Mekong River Basin (LMRB). Changes in the LMRB's runoff over the past decades are unclear because of inadequate streamflow observations. The advancement of global hydrological models (GHMs) has facilitated the understanding of runoff change worldwide. However, it is required to evaluate the performance of GHMs in simulating historical runoff change in the LMRB before assessing the runoff changes. This study aims to conduct a multi-model analysis of temporal-spatial changes in runoff in the LMRB for 1971-2010 using ten GHMs from the Inter-Sectoral Impact Model Intercomparison Project (ISIMIP) and evaluate the corresponding uncertainties among models. Results show that the model ensemble mean has the best performance than the individuals when compared with the reference data. Based on the model ensemble mean, large spatial heterogeneity of runoff is found in the LMRB, with an overall slightly positive trend (8.03%). Besides, the models perform better in estimating the trends of high flow than low flow. As to the trend of runoff in the wet and dry seasons, about 32% (70%) of the basin became drier (wetter) in the dry (wet) season. Meanwhile, 17% of the basin has experienced a trend of drier dry seasons and wetter wet seasons. Overall, our results highlight the uncertainty of the runoff changes in the LMRB in the low flow simulation, particularly requiring more attention in future model improvement. The complex change patterns of the runoff suggest the importance of accurate runoff observations and projections for better water management.
    Keywords basins ; models ; runoff ; spatial variation ; stream flow ; uncertainty ; water management ; watersheds ; High flow ; ISIMIP ; Low flow ; Multi-model
    Language English
    Dates of publication 2023-04
    Publishing place Elsevier B.V.
    Document type Article ; Online
    Note Use and reproduction
    ZDB-ID 1473173-3
    ISSN 1879-2707 ; 0022-1694
    ISSN (online) 1879-2707
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2023.129297
    Database NAL-Catalogue (AGRICOLA)

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  7. Article: Hydropower Production Benefits More From 1.5 °C than 2 °C Climate Scenario

    Meng, Ying / Liu, Junguo / Leduc, Sylvain / Mesfun, Sennai / Kraxner, Florian / Mao, Ganquan / Qi, Wei / Wang, Zifeng

    Water resources research. 2020 May, v. 56, no. 5

    2020  

    Abstract: Hydropower plays an important role as renewable and clean energy in the world's overall energy supply. Electricity generation from hydropower represented approximately 16.6% of the world's total electricity and 70% of all renewable electricity in 2015. ... ...

    Abstract Hydropower plays an important role as renewable and clean energy in the world's overall energy supply. Electricity generation from hydropower represented approximately 16.6% of the world's total electricity and 70% of all renewable electricity in 2015. Determining the different effects of 1.5 and 2 °C of global warming has become a hot spot in water resources research. However, there are still few studies on the impacts of different global warming levels on gross hydropower potential. This study used a coupled hydrological and techno‐economic model framework to assess hydropower production under global warming levels of 1.5 and 2 °C, while also considering gross hydropower potential, power consumption, and economic factors. The results show that both global warming levels will have a positive impact on the hydropower production of a tropical island (Sumatra) relative to the historical period; however, the ratio of hydropower production versus power demand provided by 1.5 °C of global warming is 40% higher than that provided by 2 °C of global warming under RCP6.0. The power generation by hydropower plants shows incongruous changing trends with hydropower potential under the same global warming levels. This inconformity occurs because the optimal sites for hydropower plants were chosen by considering not only hydropower potential but also economic factors. In addition, the reduction in CO₂ emissions under global warming of 1.5 °C (39.06 × 10⁶ t) is greater than that under global warming of 2 °C (10.20 × 10⁶ t), which reveals that global warming decreases the benefits necessary to relieve global warming levels. However, the hydropower generation and the reduction in CO₂ emissions will be far less than the energy demand when protected areas are excluded as potential sites for hydropower plants, with a sharp decrease of 40–80%. Thus, government policy‐makers should consider the trade‐off between hydropower generation and forest coverage area in nationally determined contributions.
    Keywords carbon dioxide ; clean energy ; climate ; electricity ; energy use and consumption ; forests ; power generation ; renewable electricity ; research ; water ; water power ; Indonesia
    Language English
    Dates of publication 2020-05
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 5564-5
    ISSN 1944-7973 ; 0043-1397
    ISSN (online) 1944-7973
    ISSN 0043-1397
    DOI 10.1029/2019WR025519
    Database NAL-Catalogue (AGRICOLA)

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  8. Article ; Online: Unveiling the dynamic of water-electricity conflict within and beyond megacity boundary.

    Zhao, Xu / Liao, Xiawei / Zhang, Chao / Zhang, Xinxin / Mao, Ganquan / Zhang, Shuo / Tillotson, Martin R

    Journal of environmental management

    2021  Volume 286, Page(s) 112259

    Abstract: Electricity demand in megacities may exert substantial stress on water resources, which is often expressed through the water scarcity footprint for electricity consumption (WSFE). Conversely, water scarcity may constrain electricity production, leading ... ...

    Abstract Electricity demand in megacities may exert substantial stress on water resources, which is often expressed through the water scarcity footprint for electricity consumption (WSFE). Conversely, water scarcity may constrain electricity production, leading to increased vulnerability for megacities electricity production. The WSFE and the water related vulnerability of electricity production reflect two aspects of water-electricity conflict. This varies over time by both the amount and location of electricity production. However, no studies have conducted time-series analysis to evaluate the trends of these two indicators, both in terms of severity and spatial characteristics. Our study focused on evaluating trends in water-electricity conflict both within and beyond megacity administrative boundaries. China's four provincial-level megacities, i.e. Beijing, Tianjin, Shanghai and Chongqing, were chosen as case studies. The results show that water related vulnerability of electricity production in Tianjin, Beijing, Shanghai and Chongqing was diverse and can be classified as extreme, severe, moderate and minor, respectively. Between 2006 and 2016, the WSFE of Tianjin experienced an increasing trend, and its water related vulnerability of electricity production remained at the highest level. Beijing's WSFE has decreased, but its water related vulnerability of electricity production has increased. These differing trends highlight the need for joint reductions to both WSFE and water related vulnerability of electricity production in mitigating water-electricity conflict.
    MeSH term(s) Beijing ; China ; Electricity ; Water ; Water Supply
    Chemical Substances Water (059QF0KO0R)
    Language English
    Publishing date 2021-03-04
    Publishing country England
    Document type Journal Article
    ZDB-ID 184882-3
    ISSN 1095-8630 ; 0301-4797
    ISSN (online) 1095-8630
    ISSN 0301-4797
    DOI 10.1016/j.jenvman.2021.112259
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Assessing the interlinkage of green and blue water in an arid catchment in Northwest China.

    Mao, Ganquan / Liu, Junguo / Han, Feng / Meng, Ying / Tian, Yong / Zheng, Yi / Zheng, Chunmiao

    Environmental geochemistry and health

    2019  Volume 42, Issue 3, Page(s) 933–953

    Abstract: Water resource assessment is crucial for human well-being and ecosystem health. Assessments considering both blue and green water are of great significance, as green water plays a critical but often ignored role in the terrestrial ecosystem, especially ... ...

    Abstract Water resource assessment is crucial for human well-being and ecosystem health. Assessments considering both blue and green water are of great significance, as green water plays a critical but often ignored role in the terrestrial ecosystem, especially in arid and semi-arid regions. Many approaches have been developed for green and blue water valuation; however, few approaches consider the interrelationship between green and blue water. This study proposed a new framework for green and blue water assessment by considering the interactions between green and blue water and the connections between human and natural ecosystems in an arid endorheic river basin where hydrological cycling is dramatically altered by human activities. The results show that even though green water is the dominant water resource, blue water is also critical. Most of the blue water is redirected back into the soil through physical and human-induced processes to meet the water demand of the ecosystem. The blue and green water regimes are found to be totally different in different ecosystems due to the temporal and spatial variability in water supply and consumption. We also found that humans are using an increasing proportion of water, resulting in decreasing water availability. Extensive water use by humans reduces the water availability for the natural ecosystem. Approximately 38.6% of the vegetation-covered area, which is dominated by farmland and forest, may face a moderate or high risk of increased conflict and tension over freshwater. This study provides crucial information to better understand the interactions between green and blue water and the relations between humans and nature by explicitly assessing water resources. It also provides crucial information for water management strategies that aim to balance humankind and nature.
    MeSH term(s) China ; Conservation of Water Resources/methods ; Desert Climate ; Ecosystem ; Fresh Water ; Groundwater ; Humans ; Hydrology/methods ; Recycling ; Rivers ; Soil/chemistry ; Water Resources ; Water Supply
    Chemical Substances Soil
    Language English
    Publishing date 2019-09-07
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 52039-1
    ISSN 1573-2983 ; 0142-7245 ; 0269-4042
    ISSN (online) 1573-2983
    ISSN 0142-7245 ; 0269-4042
    DOI 10.1007/s10653-019-00406-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Intercomparison of ten ISI-MIP models in simulating discharges along the Lancang-Mekong River basin.

    Chen, He / Liu, Junguo / Mao, Ganquan / Wang, Zifeng / Zeng, Zhenzhong / Chen, Aifang / Wang, Kai / Chen, Deliang

    The Science of the total environment

    2020  Volume 765, Page(s) 144494

    Abstract: Water resources are of strategic importance for socioeconomic development. Many hydrological models (HMs) and land surface models (LSMs) have been developed for water resources assessment. However, systematic evaluation of discharge simulation from ... ...

    Abstract Water resources are of strategic importance for socioeconomic development. Many hydrological models (HMs) and land surface models (LSMs) have been developed for water resources assessment. However, systematic evaluation of discharge simulation from multiple models is still lacking in the Lancang-Mekong River basin. Here, we evaluated the performances of ten HMs and LSMs by evaluating their simulated discharge against observations at the basin scale. The selected models were within the Inter-Sectoral Impact Model Intercomparison Project (ISI-MIP2a) framework driven by Global Soil Wetness Project 3 (GSWP3) climate forcing data. Five discharge percentile series were used to evaluate the model performances for low, mean, and high flows. The intercomparison according to four statistical criteria revealed considerable differences exist in model performances for different discharge percentiles, indicating a large uncertainty caused by the choice of models with different degree of physical complexity and sensitivity to the quality of the input data. The models generally performed better for high flow than for low flow. Furthermore, the models generally performed better in downstream than in upstream, with the exception of close to the estuary, where complex processes involving interactions between freshwater and saline water are present. It is not surprising that the two calibrated model (WaterGAP2 and WAYS) are superior over the other models. This systematic intercomparison provides insights into the model behaviours and accuracies in discharges predicting with varying intensities, which can aid in quantifying uncertainties in water resources simulation at the basin scale.
    Language English
    Publishing date 2020-12-24
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2020.144494
    Database MEDical Literature Analysis and Retrieval System OnLINE

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