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  • 1
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    Assessment of Urbanization-Induced Land-Use Change and Its Impact on Temperature, Evaporation, and Humidity in Central Vietnam
    MDPI AG ; 2022
    In:  Water Vol. 14, No. 21 ( 2022-10-24), p. 3367-
    Details
    In: Water, MDPI AG, Vol. 14, No. 21 ( 2022-10-24), p. 3367-
    Kurzfassung: In the present day, the acceleration of urban surface heat impacts resulting from urbanization and industrialization is critical for citizens and municipal governments in developing-country cities. The previous key findings have indicated the association between urban surface heat and the following areas: forests, mixed agricultural land, built-up area, and water bodies. This study was motivated by a lack of knowledge regarding the variation of temperature, evaporation, and humidity in Central Vietnam’s major region. The non-parametric Mann–Kendall test, Sen’s slope estimator, and Landsat image analysis were employed to determine the trend and statistical significance of the variables across the 42-year study period for Da Nang city and Quang Nam province. Our results show that Da Nang city has a consistent trend with a high correlation between temperature, evaporation, and relative humidity, whereas Quang Nam province showed an inverse relationship between temperature and relative humidity since the beginning of the regional urbanization. The maximum, minimum, and mean temperatures have increased by at least 0.29 °C in Quang Nam province and 0.71 °C in Da Nang city since 2000. Between 1979 and 2021, the frequency of days with temperatures exceeding 35 °C has increased by two and seven days during the past decade at the meteorological stations in Da Nang and Tam Ky, respectively. The temperature in Da Nang city varied from 31.80 °C to 32.82 °C with high temperatures concentrated in urbanized regions with less coverage of small trees, plants, and water bodies. Thus, the results of this study will serve as a scientific basis for decision-makers and regional officials for land-use management and to increase community awareness of sustainable planning, particularly in Da Nang city and Quang Nam province in Central Vietnam.
    Materialart: Online-Ressource
    ISSN: 2073-4441
    URL: Article
    DOI: 10.3390/w14213367
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2022
    ZDB Id: 2521238-2
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  • 2
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    Hydraulic Conductivity Tests in the Triaxial Stress State: Is Peat an Aquitard or an Aquifer?
    MDPI AG ; 2023
    In:  Water Vol. 15, No. 6 ( 2023-03-10), p. 1064-
    Details
    In: Water, MDPI AG, Vol. 15, No. 6 ( 2023-03-10), p. 1064-
    Kurzfassung: The characteristics of peat’s are crucial for understanding natural processes and their suitable shaping through the management of water relations. This study focused on the results of one of the first hydraulic conductivity (k) laboratory tests of exemplary peat samples from the Biebrza Valley (a peatland of very high environmental importance) in relation to the stress state and hydraulic gradient. Further, the research was devoted to a specific test procedure of peat permeability as a key feature for landform development in wetlands. Detailed tests of dark brown/black samples were selected as the reference for the research investigations. Four long-term test series of water permeability were performed in a modified triaxial compression apparatus. In all selected hydraulic gradient variants (i = 5,10,25,40,55,85), the k values decreased from 6 × 10−8 m/s to 1.6 × 10−10 m/s with a stepwise increase in the effective confining pressures tested (10, 15, 30, 45, and 90 kPa). These results were related to the inherent soil features—a relatively high peat decomposition and external driver—confining pressure (radial stress) magnitude. Compared to the other Polish peat tests, the determined k values were at the lower end of their hydraulic conductivity range. The analysed organic soil is not a typical aquifer. Despite very high porosities (~88%) and a high organic matter content (81.1–89.4%) which is favourable for water accumulation, the characterized peat showed relatively low hydraulic conductivity values. Thus, this specific soil may differentiate the groundwater flow as it complicates strong contact with surface water.
    Materialart: Online-Ressource
    ISSN: 2073-4441
    URL: Article
    DOI: 10.3390/w15061064
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2023
    ZDB Id: 2521238-2
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  • 3
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    A FLOW AND TRANSPORT MODEL AS A TOOL FOR SOLVING THE PROBLEM OF GROUNDWATER POLLUTION IN THE VICINITY OF CELSA HUTA OSTROWIEC
    Polish Geological Institute - National Research Institute (PGI-NRI) ; 2018
    In:  Biuletyn Państwowego Instytutu Geologicznego Vol. 471 ( 2018-10-1), p. 147-158
    Details
    In: Biuletyn Państwowego Instytutu Geologicznego, Polish Geological Institute - National Research Institute (PGI-NRI), Vol. 471 ( 2018-10-1), p. 147-158
    Kurzfassung: The article presents the environmental problem that occurred in the vicinity of Celsa Huta Ostrowiec, where concentrations of trichloroethene and tetrachloroethene in wells were detected. The three-dimensional numerical groundwater flow and transport models were calibrated against trichloroethene measurements. Model studies were carried out for different scenarios taking into account the type of pollution source (point and spatial distributed) and the nature of the source itself (incidental and continuous in time). The modelling results made it possible to indicate the most likely place and time of contaminant release into the soil and water environment.
    Materialart: Online-Ressource
    ISSN: 0867-6143
    URL: Journal
    URL: Article
    DOI: 10.5604/08676143
    DOI: 10.5604/01.3001.0012.5053
    Sprache: Englisch
    Verlag: Polish Geological Institute - National Research Institute (PGI-NRI)
    Publikationsdatum: 2018
    ZDB Id: 2555273-9
    SSG: 13
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  • 4
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    Investigating the Future Flood and Drought Shifts in the Transboundary Srepok River basin Using CMIP6 Projections_supp1-3380514.docx
    Institute of Electrical and Electronics Engineers (IEEE) ; 2024
    In:  IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
    Details
    In: IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Institute of Electrical and Electronics Engineers (IEEE)
    Materialart: Online-Ressource
    ISSN: 1939-1404 , 2151-1535
    URL: Article
    URL: Article
    DOI: 10.1109/JSTARS.2024.3380514
    DOI: 10.1109/JSTARS.2024.3380514/mm1
    Sprache: Unbekannt
    Verlag: Institute of Electrical and Electronics Engineers (IEEE)
    Publikationsdatum: 2024
    ZDB Id: 2457423-5
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  • 5
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    A Velocity-Oriented Approach for Modflow
    Springer Science and Business Media LLC ; 2017
    In:  Transport in Porous Media Vol. 119, No. 2 ( 2017-9), p. 373-390
    Details
    In: Transport in Porous Media, Springer Science and Business Media LLC, Vol. 119, No. 2 ( 2017-9), p. 373-390
    Materialart: Online-Ressource
    ISSN: 0169-3913 , 1573-1634
    URL: Article
    DOI: 10.1007/s11242-017-0886-0
    Sprache: Englisch
    Verlag: Springer Science and Business Media LLC
    Publikationsdatum: 2017
    ZDB Id: 1473676-7
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  • 6
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    Groundwater–Surface Water Interaction—Analytical Approach
    MDPI AG ; 2020
    In:  Water Vol. 12, No. 6 ( 2020-06-23), p. 1792-
    Details
    In: Water, MDPI AG, Vol. 12, No. 6 ( 2020-06-23), p. 1792-
    Kurzfassung: Modelling of water flow in the hyporheic zone and calculations of water exchange between groundwater and surface waters are important issues in modern environmental research. The article presents the Analytical Hyporheic Flux approach (AHF) permitting calculation of the amount of water exchange in the hyporheic zone, including vertical water seepage through the streambed and horizontal seepage through river banks. The outcome of the model, namely water fluxes, is compared with the corresponding results from the numerical model SEEP2D and simple Darcy-type model. The errors of the AHF model, in a range of 11–16%, depend on the aspect ratio of water depth to river width, and the direction of the river–aquifer water exchange, i.e., drainage or infiltration. The AHF model errors are significantly lower compared to the often-used model based on vertical water seepage through the streambed described by Darcy’s law.
    Materialart: Online-Ressource
    ISSN: 2073-4441
    URL: Article
    DOI: 10.3390/w12061792
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2521238-2
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  • 7
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    Modelling of Groundwater–Surface Water Interaction Applying the Hyporheic Flux Model
    MDPI AG ; 2020
    In:  Water Vol. 12, No. 12 ( 2020-11-24), p. 3303-
    Details
    In: Water, MDPI AG, Vol. 12, No. 12 ( 2020-11-24), p. 3303-
    Kurzfassung: The objective of the present paper is to develop a methodology that could allow the representation of the analytical hyporheic flux equation model (AHF) in a numerical model done in MODFLOW. Therefore, the scope of the research is to show the viability of the methodology suggested in a real case (Biebrza river, Poland, Europe). Considering that the model requires extensive manipulation in the creation of the packages, a test phase through the seepage package of MODFLOW is carried out with the aim of representing the river package of MODFLOW. FloPy is the tool chosen to develop this implementation due to the versatility of manipulating the packages available in MODFLOW through coding. The obtained results showed a correct implementation of the AHF model using the example of the Biebrza River. The results obtained will enable a better understanding regarding the modelling of the interaction between the river and the aquifer, considering streams with specific geometries where the depth is dimensionally higher than the width.
    Materialart: Online-Ressource
    ISSN: 2073-4441
    URL: Article
    DOI: 10.3390/w12123303
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2521238-2
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  • 8
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    Quantification of Gridded Precipitation Products for the Streamflow Simulation on the Mekong River Basin Using Rainfall Assessment Framework: A Case Study for the Srepok River Subbasin, Central Highland Vietnam
    MDPI AG ; 2023
    In:  Remote Sensing Vol. 15, No. 4 ( 2023-02-13), p. 1030-
    Details
    In: Remote Sensing, MDPI AG, Vol. 15, No. 4 ( 2023-02-13), p. 1030-
    Kurzfassung: Many fields have identified an increasing need to use global satellite precipitation products for hydrological applications, especially in ungauged basins. In this study, we conduct a comprehensive evaluation of three Satellite-based Precipitation Products (SPPs): Integrated Multi–satellitE Retrievals for GPM (IMERG) Final run V6, Soil Moisture to Rain (SM2RAIN)-Advanced SCATterometer (ASCAT) V1.5, and Multi-Source Weighted-Ensemble Precipitation (MSWEP) V2.2 for a subbasin of the Mekong River Basin (MRB). The study area of the Srepok River basin (SRB) represents the Central Highland sub-climatic zone in Vietnam under the impacts of newly built reservoirs during 2001–2018. In this study, our evaluation was performed using the Rainfall Assessment Framework (RAF) with two separated parts: (1) an intercomparison of rainfall characteristics between rain gauges and SPPs; and (2) a hydrological comparison of simulated streamflow driven by SPPs and rain gauges. Several key findings are: (1) IMERGF-V6 shows the highest performance compared to other SPP products, followed by SM2RAIN-ASCAT V1.5 and MSWEP V2.2 over assessments in the RAF framework; (2) MSWEP V2.2 shows discrepancies during the dry and wet seasons, exhibiting very low correlation compared to rain gauges when the precipitation intensity is greater than 15 mm/day; (3) SM2RAIN–ASCAT V1.5 is ranked as the second best SPP, after IMERGF-V6, and shows good streamflow simulation, but overestimates the wet seasonal rainfall and underestimates the dry seasonal rainfall, especially when the precipitation intensity is greater than 20 mm/day, suggesting the need for a recalibration and validation of its algorithm; (4) SM2RAIN-ASCAT had the lowest bias score during the dry season, indicating the product’s usefulness for trend analysis and drought detection; and (5) RAF shows good performance to evaluate the performance of SPPs under the impacts of reservoirs, indicating a good framework for use in other similar studies. The results of this study are the first to reveal the performance of MSWEP V2.2 and SM2RAIN-ASCAT V1.5. Additionally, this study proposes a new rainfall assessment framework for a Vietnam basin which could support future studies when selecting suitable products for input into hydrological model simulations in similar regions.
    Materialart: Online-Ressource
    ISSN: 2072-4292
    URL: Article
    DOI: 10.3390/rs15041030
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2023
    ZDB Id: 2513863-7
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  • 9
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    Mire Development and Disappearance due to River Capture as Hydrogeological and Geomorphological Consequences of LGM Ice-Marginal Valley Evolution at the Vistula-Neman Watershed
    MDPI AG ; 2020
    In:  Geosciences Vol. 10, No. 9 ( 2020-09-11), p. 363-
    Details
    In: Geosciences, MDPI AG, Vol. 10, No. 9 ( 2020-09-11), p. 363-
    Kurzfassung: The advances and retreats of ice sheets during Pleistocene significantly changed high- and mid-latitude landscapes and hydrological systems, albeit differently, in North America and Europe. On the southern margin of the Last Glacial Maximum (LGM) in the Baltic Sea basin, a specific type of valley has developed between glacial margins and upland or mountain slopes. We studied new geological data (boreholes, electrical resistivity imaging (ERI) from this geomorphic setting in Northeast Poland to understand: (1) how the landscape and river network evolved to eventually produce peat mires during the Holocene, and (2) the nature of groundwater recharge to fens in the upper Biebrza Valley. We present the results on a geological cross-section with hydrogeological interpretation. We also discuss regional geomorphology. In addition, we present the LGM extent derived from a spatial distribution of Vistulian (Weichselian) terminal moraines. These end moraines are also interpreted as Saalian kames. Thus, we additionally present another method of LGM extent delineation from a physicogeographical division. We link the steep slopes of the studied valley walls (kame terrace fronts) with thermokarst erosion in the periglacial zone. We then document the hydrogeological window (DISCONTINUITY in the till layer over the confined aquifer), which enables the outflow of groundwater into the peat bog. Although minerotrophic fen mire development in the study area is likely to be sustained in the near future through sufficient groundwater supply, the projected capture of the Biebrza River by the Neman River will not allow for sustaining peatland development.
    Materialart: Online-Ressource
    ISSN: 2076-3263
    URL: Article
    DOI: 10.3390/geosciences10090363
    Sprache: Englisch
    Verlag: MDPI AG
    Publikationsdatum: 2020
    ZDB Id: 2655946-8
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  • 10
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    Supplemental Information 1: Raw data collected from the piezometers
    PeerJ ; 2022
    In:  PeerJ Vol. 10 ( 2022-06-22), p. e13418-
    Details
    In: PeerJ, PeerJ, Vol. 10 ( 2022-06-22), p. e13418-
    Kurzfassung: The area of interest is the Upper Biebrza Valley, located in NE Poland. Study focus We examined water exchange at the river-fen interface in a near-natural wetland system using the combined field research-modeling approach. The authors chose the Biebrza River as the research object: it is a specific case of fen marginal valley rivers, and it flows in the peat layer without direct connection to the mineral soil layer. Our case study introduces two new aspects not yet considered in the scientific literature: (1) the riparian aquifer is fen and (2) the river has no direct contact with the mineral layer. The following research questions were investigated: What is the role of the river in feeding and draining a fen? Which drainage paths are important for water exchange in a near-natural river-fen system? How important are the morphological settings for the river-fen relations? We applied a systematic hydrological research approach based on field measurements and observations of the river and surrounding fen hydrological characteristics, as well as on the modelling results. New hydrological insights for the region We demonstrated that morphological settings have a significant influence on river-fen relations. We also demonstrated that due to the undeniable need to introduce increased protection and restoration of marginal fens, we may focus on river status in narrow valleys; however, in the wide valleys, the limitation of the drainage layer by decreasing the intensity of evapotranspiration is more promising. We propose to distinguish zones in the fen river valley to include them when proposing protection or conservation plans.
    Materialart: Online-Ressource
    ISSN: 2167-8359
    URL: Article
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    DOI: 10.7717/peerj.13418
    DOI: 10.7717/peerj.13418/fig-1
    DOI: 10.7717/peerj.13418/fig-2
    DOI: 10.7717/peerj.13418/fig-3
    DOI: 10.7717/peerj.13418/fig-4
    DOI: 10.7717/peerj.13418/fig-5
    DOI: 10.7717/peerj.13418/fig-6
    DOI: 10.7717/peerj.13418/fig-7
    DOI: 10.7717/peerj.13418/fig-8
    DOI: 10.7717/peerj.13418/fig-9
    DOI: 10.7717/peerj.13418/fig-10
    DOI: 10.7717/peerj.13418/table-1
    DOI: 10.7717/peerj.13418/table-2
    DOI: 10.7717/peerj.13418/table-3
    DOI: 10.7717/peerj.13418/table-4
    DOI: 10.7717/peerj.13418/supp-1
    Sprache: Englisch
    Verlag: PeerJ
    Publikationsdatum: 2022
    ZDB Id: 2703241-3
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