LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 7 of total 7

Search options

  1. Article ; Online: Analyzing river disruption factors and ecological flow in China's Liu River Basin amid environmental changes.

    Li, Mingqian / Wang, He / Gu, Hongbiao / Chi, Baoming

    Environmental science and pollution research international

    2024  Volume 31, Issue 17, Page(s) 26282–26299

    Abstract: Water resources variability and availability in a basin affect river flows and sustain river ecosystems. Climate change and human activities disrupt runoff sequences, causing water environmental issues like river channel interruptions. Therefore, ... ...

    Abstract Water resources variability and availability in a basin affect river flows and sustain river ecosystems. Climate change and human activities disrupt runoff sequences, causing water environmental issues like river channel interruptions. Therefore, determining ecological flow in changing environments is challenging in hydrological research. Based on an analysis of long-term changes in hydrological and meteorological variables and interruption conditions in the semi-arid Liu River Basin (LRB), this study summarizes the controlling factors of river interruption at different temporal and spatial scales and proposes a framework to determine ecological flow under changing environments. Hydrological model and the monthly optimal probability distribution were used to determine the optimal ecological runoff of LRB. The results showed that from 1956 to 2017, precipitation and potential evapotranspiration in the basin showed no significant decreasing trend, but the streamflow significantly decreased, and the downstream interruption worsened, with an average annual interruption duration of 194 days at Xinmin Station from 1988 to 2017. The controlling factors of river interruption are as follows: (1) soil and water conservation measures in the upstream significantly reduce the runoff capacity; (2) the operation mode of the controlling reservoir in the middle reaches changes from "all-year discharge" to "winter storage and spring release" to "combined storage and supply," severing the hydraulic connection between upstream and downstream; and (3) siltation in the downstream river channel coupled with over-extraction of groundwater increases the seepage capacity of the river. The monthly ecological flow of Naodehai Reservoir was determined by considering the monthly seepage losses after reconstructing the natural runoff using the SWAT model and determining the optimal probability distribution function for monthly runoff. The findings are important for downstream LRB ecological restoration and for determining the ecological flow of other river basins in changing environments.
    MeSH term(s) Humans ; Ecosystem ; Water Movements ; Environmental Monitoring ; Soil ; China
    Chemical Substances Soil
    Language English
    Publishing date 2024-03-19
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-024-32915-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 5915: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  2. Article ; Online: Quantifying the impact of climate variability and human activities on streamflow variation in Taoer River Basin, China.

    Li, Mingqian / Gu, Hongbiao / Wang, He / Wang, Ying / Chi, Baoming

    Environmental science and pollution research international

    2023  Volume 30, Issue 19, Page(s) 56425–56439

    Abstract: Climate variability and human activity are the two driving forces that alter the hydrological cycle and spatiotemporal distribution of water resources. Using the Taoer River Basin (TRB) as an example, this study analyzed the impacts of climate ... ...

    Abstract Climate variability and human activity are the two driving forces that alter the hydrological cycle and spatiotemporal distribution of water resources. Using the Taoer River Basin (TRB) as an example, this study analyzed the impacts of climate variability and human activities on streamflow discharge in various periods and the resulting hydrological alterations. First, historical streamflow data were divided into four periods (baseline period and altered periods 1, 2, and 3). Based on the proposed basic identification framework, four assessment methods (the hydrological sensitivity method, distributed hydrological model, linear regression model, and runoff restoring computation) are used and provided relatively consistent estimates of streamflow attribution. Climate variability is the driving factor for streamflow changes, and the relative contributions in altered periods 1, 2, and 3 are 81% (+ 50.34 mm), 68% (+ 13.37 mm), and 53% (-19.23 mm), respectively. In addition, climate variability and reservoir construction have different impacts on the hydrological regime at different periods, and reservoir regulation's effect on the hydrological regime depends on climatic conditions. Combined with this case study, we further discuss the necessity of breakpoint selection and period subdivision in the attribution of streamflow changes, and analyze the applicability of different methods with current ideas for improvement. This study not only has practical significance for water resource planning and adaptive policy formulation in the TRB but also provides a useful reference for similar studies.
    MeSH term(s) Humans ; Rivers ; China ; Human Activities ; Hydrology ; Water Cycle ; Climate Change
    Language English
    Publishing date 2023-03-15
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1178791-0
    ISSN 1614-7499 ; 0944-1344
    ISSN (online) 1614-7499
    ISSN 0944-1344
    DOI 10.1007/s11356-023-26271-3
    Database MEDical Literature Analysis and Retrieval System OnLINE

    Full text online

    More links

    Kategorien

    In stock of ZB MED Bonn / Germany

    Z 5915: Show issues

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article: Study on the influence of seawater density variation on sea water intrusion in confined coastal aquifers

    Na, Jin / Chi, Baoming / Zhang, Yan / Li, Jiale / Jiang, Xue

    Environmental earth sciences. 2019 Dec., v. 78, no. 24

    2019  

    Abstract: The coupled influence of seawater density and groundwater level variation plays an import role in seawater intrusion in confined coastal aquifers. In this study, the effects of seawater density variations along with changing hydraulic gradients were ... ...

    Abstract The coupled influence of seawater density and groundwater level variation plays an import role in seawater intrusion in confined coastal aquifers. In this study, the effects of seawater density variations along with changing hydraulic gradients were investigated by conducting laboratory experiments and numerical simulations. Parameters of salinty and density in the experiments are based on the references related Bohai sea of China. The results indicate that the higher density of saltwater facilitates the seawater intrusion into the aquifers at the bottom and accelerates the circulation at the changing hydraulic gradient. Even slight variations in saltwater density can change the steady-state conditions in a confined aquifer, which should be considered when attempting to control the intrusion of seawater. Moreover, the influence of seawater density variations on transient salt-wedge dynamics was also examined in these experiments. Numerical modelling was simultaneously performed to mimic the behaviour of SW using the TOUGH2/EOS7 package. The simulated results were generally consistent with those obtained from the experiments. This study is conducive to further understand the mechanism of seawater intrusion, thereby leading to effective management of the problem in coastal areas.
    Keywords coasts ; confined aquifer ; mathematical models ; saline water ; saltwater intrusion ; seawater ; water table ; China ; Yellow Sea
    Language English
    Dates of publication 2019-12
    Size p. 669.
    Publishing place Springer Berlin Heidelberg
    Document type Article
    ZDB-ID 2493699-6
    ISSN 1866-6299 ; 1866-6280
    ISSN (online) 1866-6299
    ISSN 1866-6280
    DOI 10.1007/s12665-019-8684-3
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  4. Article: [Distribution Characteristics and Influencing Factors of Nitrate Pollution in Shallow Groundwater of Liujiang Basin].

    Wang, He / Gu, Hong-biao / Chi, Bao-ming / Li, Hai-jun / Jiang, Hai-ning

    Huan jing ke xue= Huanjing kexue

    2016  Volume 37, Issue 5, Page(s) 1699–1706

    Abstract: Taking the nitrate in shallow groundwater of Liujiang basin as the research object, a total of 215 groups of shallow groundwater samples were collected during the wet period in July 2014 and the drought period in April 2015 on the basis of groundwater ... ...

    Abstract Taking the nitrate in shallow groundwater of Liujiang basin as the research object, a total of 215 groups of shallow groundwater samples were collected during the wet period in July 2014 and the drought period in April 2015 on the basis of groundwater pollution investigation. The characteristics of spatial and temporal variability and the account of nitrate pollution were analyzed based on the model of semivariogram, the geostatistics of ArcGIS and factor analysis, respectively. The results showed that the study region in the southeast was the main nitrate-polluted area, with concentrations of up to 30-120 mg · L⁻¹, in both wet and drought periods, while the nitrate-contaminated area in drought period was about 1. 4 times higher than that in wet period. The spatial distribution of nitrate was primarily influenced by human activities and the geological conditions, and secondarily by Eh, DO, pH and landform conditions. The nitrate concentration was less than 20 mg · L⁻¹ in north. Pollution in local middle area was rather serious, due to human activities and the loss of nitrogen fertilizer in agricultural cultivation; the area to the south, which was confined by impervious boundary, was seriously contaminated, as indicated by the nitrate accumulation effects.
    MeSH term(s) Agriculture ; China ; Environmental Monitoring ; Fertilizers ; Groundwater/chemistry ; Nitrates/analysis ; Water Pollutants, Chemical/analysis ; Water Supply
    Chemical Substances Fertilizers ; Nitrates ; Water Pollutants, Chemical
    Language Chinese
    Publishing date 2016-05-15
    Publishing country China
    Document type English Abstract ; Journal Article
    ISSN 0250-3301
    ISSN 0250-3301
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Article: Assessment of groundwater quality and identification of contaminant sources of Liujiang basin in Qinhuangdao, North China

    Gu, Hongbiao / Chi, Baoming / Li, Haijun / Jiang, Jiyi / Qin, Wenjing / Wang, He

    Environmental earth sciences. 2015 May, v. 73, no. 10

    2015  

    Abstract: Liujiang basin is located in a typical rural mountain area dominated by agriculture and mining industry in Qinhuangdao, Hebei Province of China. Groundwater plays significant role for socioeconomic development in the area. 78 well samples and 11 spring ... ...

    Abstract Liujiang basin is located in a typical rural mountain area dominated by agriculture and mining industry in Qinhuangdao, Hebei Province of China. Groundwater plays significant role for socioeconomic development in the area. 78 well samples and 11 spring samples showed great variation of chemical compositions and groundwater quality class across the study basin. Groundwater hydrochemical type in Liujiang basin is mainly dominated by the typical Ca Mg–HCO₃SO₄or Ca Mg–SO₄HCO₃. The relative abundance of constituents is in the following order: Ca²⁺ > Mg²⁺ > Na⁺ > K⁺for cations and HCO₃⁻ > SO₄²⁻ > Cl⁻for anions. Spring water quality is all good for drinking and irrigation, whereas about 33.00 % of the well water samples were not suitable for drinking and the exceeding indices included NO₃, total hardness, total dissolved solids and SO₄, and seven well samples were not suitable for agriculture use. The control of sodium and salinity hazard is required for irrigation. Natural processes include weathering-dominated, mineral weathering and ion exchange controlling groundwater chemistry. Principal component analysis and Pearson correlation matrices were used to identify groundwater contaminant sources and can be categorized as follows: (1) natural minerals dissolution and mine water mixing (2) domestic sewage and septic tank contamination and (3) agricultural fertilizer contamination. This study suggested that both natural and anthropogenic processes contributed to chemical composition of groundwater in Liujiang basin, especially the NO₃concentration is more than the acceptable limits in groundwater used for drinking purposes, indicating that anthropogenic nitrogen pollution is currently serious.
    Keywords anions ; bicarbonates ; biochemical polymorphism ; calcium ; cations ; drinking ; fertilizers ; groundwater ; hardness ; ion exchange ; irrigation ; magnesium ; minerals ; mining ; mixing ; nitrogen ; pollution ; principal component analysis ; salinity ; sewage ; socioeconomic development ; sodium ; sulfates ; total dissolved solids ; water quality ; weathering ; China
    Language English
    Dates of publication 2015-05
    Size p. 6477-6493.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 2493699-6
    ISSN 1866-6299 ; 1866-6280
    ISSN (online) 1866-6299
    ISSN 1866-6280
    DOI 10.1007/s12665-014-3870-9
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  6. Article: Identifying the sustainable groundwater yield in a Chinese semi-humid basin

    Shi, Fengzhi / Chi, Baoming / Zhao, Chengyi / Yang, Tao / Paix, Mupenzi Jean de la / Lu, Ying / Gao, Shuqin

    Journal of hydrology. 2012 July 25, v. 452-453

    2012  

    Abstract: The primary goal of this work was to identify the sustainable groundwater yield which is a key reference of reasonable groundwater development, but also a complex issue in current hydrogeologic science. One major limit to identify sustainable groundwater ...

    Abstract The primary goal of this work was to identify the sustainable groundwater yield which is a key reference of reasonable groundwater development, but also a complex issue in current hydrogeologic science. One major limit to identify sustainable groundwater yield is the lack of a unified evaluation criterion because there are many factors involved in hydrological systems that are difficult to quantify. To address this problem, an integrated evaluation model was constructed for a series of purposes including the maximal efficiency of water use, the integral benefit of development and utilization, the optimized environmental water demand and the minimal anthropogenic influence on groundwater system. It consists of a benefit model, a water cycling simulation model and an optimization model. The basin-wide model for water cycling simulation was a basic component to simulate scenarios with different constraints, and the best water development strategy was thereafter identified using the integral benefit model of water resources development. The Yinma River basin in a Chinese semi-humid region was selected as the case study area. Results indicated the optimized groundwater yield could be sustained by intensive reservoir supply and maintain suitable ecological water demand simultaneously. The work proposed a potential groundwater utilization strategy for economically developing countries across the world.
    Keywords anthropogenic activities ; basins ; case studies ; developing countries ; groundwater ; hydrologic cycle ; hydrologic factors ; simulation models ; water resources ; water use efficiency ; watersheds
    Language English
    Dates of publication 2012-0725
    Size p. 14-24.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1473173-3
    ISSN 0022-1694
    ISSN 0022-1694
    DOI 10.1016/j.jhydrol.2012.05.017
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

  7. Article: Assessment of groundwater quality and identification of contaminant sources of Liujiang basin in Qinhuangdao, North China

    Gu, Hongbiao / Chi, Baoming / Li, Haijun / Jiang, Jiyi / Qin, Wenjing / Wang, He

    Environmental earth sciences

    Volume v. 73,, Issue no. 1

    Abstract: Liujiang basin is located in a typical rural mountain area dominated by agriculture and mining industry in Qinhuangdao, Hebei Province of China. Groundwater plays significant role for socioeconomic development in the area. 78 well samples and 11 spring ... ...

    Abstract Liujiang basin is located in a typical rural mountain area dominated by agriculture and mining industry in Qinhuangdao, Hebei Province of China. Groundwater plays significant role for socioeconomic development in the area. 78 well samples and 11 spring samples showed great variation of chemical compositions and groundwater quality class across the study basin. Groundwater hydrochemical type in Liujiang basin is mainly dominated by the typical Ca Mg–HCO₃SO₄or Ca Mg–SO₄HCO₃. The relative abundance of constituents is in the following order: Ca²⁺ > Mg²⁺ > Na⁺ > K⁺for cations and HCO₃⁻ > SO₄²⁻ > Cl⁻for anions. Spring water quality is all good for drinking and irrigation, whereas about 33.00 % of the well water samples were not suitable for drinking and the exceeding indices included NO₃, total hardness, total dissolved solids and SO₄, and seven well samples were not suitable for agriculture use. The control of sodium and salinity hazard is required for irrigation. Natural processes include weathering-dominated, mineral weathering and ion exchange controlling groundwater chemistry. Principal component analysis and Pearson correlation matrices were used to identify groundwater contaminant sources and can be categorized as follows: (1) natural minerals dissolution and mine water mixing (2) domestic sewage and septic tank contamination and (3) agricultural fertilizer contamination. This study suggested that both natural and anthropogenic processes contributed to chemical composition of groundwater in Liujiang basin, especially the NO₃concentration is more than the acceptable limits in groundwater used for drinking purposes, indicating that anthropogenic nitrogen pollution is currently serious.
    Keywords calcium ; fertilizers ; mining ; water quality ; magnesium ; drinking ; salinity ; total dissolved solids ; irrigation ; nitrogen ; groundwater ; bicarbonates ; mixing ; ion exchange ; hardness ; anions ; principal component analysis ; sewage ; socioeconomic development ; sulfates ; biochemical polymorphism ; pollution ; sodium ; weathering ; cations ; minerals
    Language English
    Document type Article
    ISSN 1866-6280
    Database AGRIS - International Information System for the Agricultural Sciences and Technology

    More links

    Kategorien

    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

To top