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  1. Article ; Online: Primarily investigation with multiple methods on permafrost state around a rapid change lake in the interior of the Tibet Plateau

    Zekun Ding / Fujun Niu / Yanhu Mu / Peifeng He / Zeyong Gao / Xingwen Fan

    Environmental Research Letters, Vol 18, Iss 11, p

    2023  Volume 114010

    Abstract: Changes of the lakes on high-altitude regions of the Tibet Plateau influence the state of the surrounding permafrost. Due to the climate warming and wetting trend, extreme events including lake outburst has occurred more frequent. In 2011, an outburst ... ...

    Abstract Changes of the lakes on high-altitude regions of the Tibet Plateau influence the state of the surrounding permafrost. Due to the climate warming and wetting trend, extreme events including lake outburst has occurred more frequent. In 2011, an outburst event occurred on the Zonag Lake and this event changed the water distribution in the basin, leading a rapid expansion of the Tailwater lake, named as the Salt Lake. However, the construction of the drainage channel in the Salt Lake ended the expansion process and the shrinkage of the lake started since 2020. To investigate the permafrost state around the Salt Lake, multiple methods, including drilling boreholes, the unmanned aerial vehicle survey and the ground penetrating radar detection have been applied. By integrating these multi-source data, the thermal regime, topography and the spatial distribution of the permafrost around the Salt Lake were analyzed. The result showed that the permafrost state around the Salt Lake was related to the distance from the lake water. The permafrost table appears at 90 m away from the Salt Lake and interrupted by a nearby thermokarst lake at 220 m. The ground temperature in the natural field is 0.2 °C lower than the temperature in the lake at a depth of −5 m.
    Keywords permafrost ; ground temperature ; UAV ; GPR ; Environmental technology. Sanitary engineering ; TD1-1066 ; Environmental sciences ; GE1-350 ; Science ; Q ; Physics ; QC1-999
    Subject code 333 ; 550
    Language English
    Publishing date 2023-01-01T00:00:00Z
    Publisher IOP Publishing
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: A Three-Stage Coordinated Optimization Scheduling Strategy for a CCHP Microgrid Energy Management System

    Yan Xu / Zhao Luo / Zhendong Zhu / Zhiyuan Zhang / Jinghui Qin / Hao Wang / Zeyong Gao / Zhichao Yang

    Processes, Vol 8, Iss 2, p

    2020  Volume 245

    Abstract: With renewable generation resources and multiple load demands increasing, the combined cooling, heating, and power (CCHP) microgrid energy management system has attracted much attention due to its high efficiency and low emissions. In order to realize ... ...

    Abstract With renewable generation resources and multiple load demands increasing, the combined cooling, heating, and power (CCHP) microgrid energy management system has attracted much attention due to its high efficiency and low emissions. In order to realize the integration of substation resources and solve the problems of inaccurate, random, volatile and intermittent load forecasting, we propose a three-stage coordinated optimization scheduling strategy for a CCHP microgrid. The strategy contains three stages: a day-ahead economic scheduling stage, an intraday rolling optimization stage, and a real-time adjustment stage. Forecasting data with different accuracy at different time scales were used to carry out multilevel coordination and gradually improve the scheduling plan. A case study was used to verify that the proposed scheduling strategy can mitigate and eliminate the load forecasting error of renewable energy (for power balance and scheduling economy).
    Keywords cchp ; microgrid ; three-stage optimal strategy ; energy management ; rolling optimization ; Chemical technology ; TP1-1185 ; Chemistry ; QD1-999
    Subject code 670
    Language English
    Publishing date 2020-02-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article: Assessing soil erosion and control factors by radiometric technique in the source region of the Yellow River, Tibetan Plateau

    Wang, Yibo / Fujun Niu / Qingbai Wu / Zeyong Gao

    University of Washington Quaternary research. 2014 May, v. 81, no. 3

    2014  

    Abstract: Measurements of 137Cs concentration in soils were made in a representative catchment to quantify erosion rates and identify the main factors involved in the erosion in the source region of the Yellow River in the Tibetan Plateau. In order to estimate ... ...

    Abstract Measurements of 137Cs concentration in soils were made in a representative catchment to quantify erosion rates and identify the main factors involved in the erosion in the source region of the Yellow River in the Tibetan Plateau. In order to estimate erosion rates in terms of the main factors affecting soil loss, samples were collected taking into account the slope and vegetation cover along six selected transects within the Dari County catchment. The reference inventory for the area was established at a stable, well-preserved, site of small thickness (value of 2324Bq·m−2). All the sampling sites had been eroded and 137Cs inventories varied widely in the topsoil (14.87–25.56Bq·kg−1). The effective soil loss values were also highly variable (11.03–28.35t·km−1·yr−1) in line with the vegetation cover change. The radiometric approach was useful in quantifying soil erosion rates and examining patterns of soil movement.
    Keywords cesium ; radiometry ; radionuclides ; soil erosion ; soil movement ; topsoil ; vegetation cover ; watersheds ; China ; Yellow River
    Language English
    Dates of publication 2014-05
    Size p. 538-544.
    Publishing place Elsevier Inc.
    Document type Article
    ZDB-ID 205711-6
    ISSN 0033-5894
    ISSN 0033-5894
    DOI 10.1016/j.yqres.2013.11.003
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 2010/702: Show issues

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  4. Article: Creep characteristics and process analyses of a thaw slump in the permafrost region of the Qinghai-Tibet Plateau, China

    Sun, Zhe / GuoyuLi / Fujun Niu / Yan Sun / Yibo Wang / Zeyong Gao

    Geomorphology. 2017,

    2017  

    Abstract: A thaw slump in the permafrost region of the Qinghai–Tibet Plateau was monitored to investigate typical characteristics of creep positions and processes in combination with soil property analyses. The results show that the thaw settlement exhibits a ... ...

    Abstract A thaw slump in the permafrost region of the Qinghai–Tibet Plateau was monitored to investigate typical characteristics of creep positions and processes in combination with soil property analyses. The results show that the thaw settlement exhibits a contraction effect in the horizontal direction because of uneven thaw settlement. Slope displacement of creep occurs only in the top 50 cm of the soil. The gravimetric water content, soil porosity, and soil temperature are higher near the thaw slump in thaw seasons compared with the undisturbed soil; however, the shear strength is lower. Melting ground ice releases thaw water that converges along the slope and forms an overland flow at the front part of the gentle slope area and a ponding depression at the slope bottom. The analyses of slope stability using the infinite slope model shows that the headwall of the slope is inevitably unstable and slides under saturated conditions, whereas the gentle slope area and slope bottom with slight creep displacement are relatively stable. The small retrogressive thaw slump is in an early development stage. With increasing degree of thaw settlement and rate of erosion, the headwall will become steeper and a thermokarst lake will form at the slope bottom.
    Keywords ice ; lakes ; melting ; models ; overland flow ; permafrost ; porosity ; saturated conditions ; shear strength ; soil temperature ; China
    Language English
    Size p. .
    Publishing place Elsevier B.V.
    Document type Article
    Note Pre-press version
    ZDB-ID 58028-4
    ISSN 0169-555X
    ISSN 0169-555X
    DOI 10.1016/j.geomorph.2017.04.045
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 97/130: Show issues
    + Df 22: Show issues

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