Spatial variation of saturated hydraulic conductivity of a loess slope in the South Jingyang Plateau, China

Wang, Wei; Wang, Yu; Sun, Qiming; Mao, Zhang; Qiang, Yixing; Liu, Mengmeng

doi:10.1016/j.enggeo.2017.08.002

Cited by 74 publications

(41 citation statements)

References 30 publications

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“…Saturated hydraulic conductivity is a key hydraulic parameter for controlling water infiltration and distribution (Dou et al ., ; Damiano et al ., ; Gao et al ., ; Wang et al ., ). The main factors affecting the permeability of the loess–paleosol are its moisture content, porosity, grain‐size, mineralogy and structural characteristics (particle contact mode and arrangement) (Zhao et al ., , ; Liang et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…The variation of the hydraulic conductivity of porous media and fractured media with depth is often related to parameters such as stress and porosity (Jiang et al ., ). Therefore, the hydraulic conductivity shows a tendency to decrease with depth, and parameter M is the decay exponent indicating the rate of decrease (Wang et al ., ). The decay exponents of K V and K H in the XSD sequence are 0.079 and 0.076, respectively, suggesting that both K H and K V decreased with depth, with the later showing a greater decrease (Figure ).…”

Section: Discussionmentioning

confidence: 97%

“…The Guanzhong Basin is sandwiched between the northern Shaanxi Plateau and the QMB at an average elevation of ~400 m (Xu et al ., ; Wang et al ., ). The mean annual temperature and mean annual precipitation are 13.1°C and 537 mm, respectively (Wang et al ., ). The dust deposits in the Jingyang area are characterized by multiple beds of alternating loess–paleosol that make up a 90 m thick layer mainly distributed along the river terraces and the platform (Huang et al ., ; Tan et al ., ).…”

Section: Geographical and Geochronological Backgroundmentioning

confidence: 98%

“…Previous studies on loess permeability have focused on different regions, plant types and coverage, topography, air permeability and soil types (Fu et al ., ; Wang et al ., ; Jacobs et al ., ; Metelkova et al ., ; Lu et al ., ; Chen et al ., ; Wang et al ., ). Studies of the permeability of the aeolian loess section have only considered the Malan loess (considering its loose structure, large pores, vertical joint development and engineering construction considerations) (Li and Li, ; Li et al ., , ) or the permeability of just a few layers of the loess–paleosol, generally looking at gradual changes in the soil texture and heterogeneity (Schwen et al ., ; Wang et al ., ). Although the groundwater of the Loess Plateau has been widely studied, aquifers and aquicludes are still poorly described, especially regarding groundwater occurrence regularity, migration and enrichment.…”

Section: Introductionmentioning

confidence: 99%

“…Studying the process of water infiltration and migration in loess sedimentary sequences, especially in the Loess Plateau area, has practical implications. It can be useful for preventing landslide hazards (Damiano et al ., ; Wang et al ., ), improving the efficiency of agricultural irrigation (Valdes‐Abellan et al ., ), identifying patterns of groundwater migration and enrichment (Foster et al ., ; Zhao et al ., ), and preventing and controlling groundwater resource pollution (Yang et al ., ; Chen et al ., ; Li et al ., ). Saturated hydraulic conductivity is a key hydraulic parameter for studying the permeability of loess, as this controls the infiltration process and horizontal/vertical distribution of water (Dou et al ., ; Damiano et al ., ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Hou

Qian

Zhang

et al. 2020

Earth Surf Processes Landf

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Permeability differences in multi‐cycle loess–paleosol aeolian sediments, which are still poorly understood, have the potential to significantly improve our understanding of climatic change during the glacial–interglacial periods of the Quaternary. In this study, the permeability of a well‐preserved and continuous loess–paleosol sequence in the South Jingyang Plateau was investigated. Weathering intensity was inferred using a series of climate proxies including grain‐size distribution, magnetic susceptibility and mineralogy. The results of laboratory tests showed that the average saturated hydraulic conductivity of loess layers is higher than that of paleosol layers. Also, clear differences between loess and paleosol were found in terms of depth variations of the vertical and horizontal saturated hydraulic conductivities. Differences in loess–paleosol were also found for other proxies for pedogenic weathering [i.e. clay content, sand content, Kd value (ratio of coarse silt to clay), magnetic susceptibility, dolomite content and the ratios of hornblende/illite and hornblende/chlorite]. Our results showed a high permeability of loess layers associated with weak pedogenic weathering during cold/dry paleoclimatic conditions in glacial stages. On the contrary, paleosol layers developed in a warm/humid climate during the interglacial stages experienced strong pedogenic weathering that resulted in lower permeability. Based on these results, we construct a connection between Quaternary climate change theory and the modern hydrological system. This provides a scientific basis for investigating the distribution and pollution of groundwater resources in the local region. © 2020 John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 97%

Section: Discussionmentioning

confidence: 97%

Section: Geographical and Geochronological Backgroundmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Hou

Qian

Zhang

et al. 2020

Earth Surf Processes Landf

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Laboratory study on the thermal performance of vertical U‐tube ground heat exchanger during short‐term borehole thermal energy storage ( BTES ) and heat extraction process

Wang

Yang

et al. 2020

Int J Energy Res

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Summary To explore the thermal performance of vertical U‐tube ground heat exchanger (GHE) during short‐term thermal energy storage (TES) and heat extraction process, a novel and well‐controlled sandbox with a plate heat exchanger at the bottom of GHE was proposed and established. According to the experiments of short‐term TES and heat extraction under different inlet temperature with Re between 2677 and 2823, we found that the thermal performance of GHE was mainly determined by the dynamic soil temperature distribution around GHE, which was induced by the inlet temperature and operation process of GHE. Furthermore, the energy was concentrated within a limited radius (0.4 m) around the GHE during the 8 hours TES and heat extraction process, which was of benefit to the efficient operation of GHE and the thermal environment of soil. Moreover, compared to the simple extraction process C10 (−/8°C) without TES, the heat extraction process of C5 (35/8°C) obtained a 47.8% increase of average heat extraction rate. In addition, approximately 35% of the injected heat was left in the experimental soil under thermal balance conditions C3, C5, and C7. These results show the superiority and characteristic of short‐term TES and heat extraction for GHE operation.

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Seepage mechanisms and permeability differences between loess and paleosols in the critical zone of the Loess Plateau

Hou

Qian

Zhang

et al. 2021

Earth Surf Processes Landf

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The soil in the Loess Plateau has special permeability characteristics due to the alternating distribution of loess and paleosol layers. Using an analysis of the physical properties, microstructure and thermogravimetric analysis of loess and paleosol, this paper examines strata seepage mechanisms in the loess tableland area and considers the applicability of a hydraulic conductivity empirical formula. The analysis shows that hydraulic conductivity attenuation with depth can be represented by a negative exponential model, while hydraulic conductivity values are not normally distributed. The best-fitting models of hydraulic conductivity in the horizontal (K H ) and vertical (K V ) directions are Gaussian models, and both have strong spatial correlations. This study

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Spatial variation of saturated hydraulic conductivity of a loess slope in the South Jingyang Plateau, China

Cited by 74 publications

References 30 publications

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Influence of Quaternary paleoclimate change on the permeability of the loess–paleosol sequence in the Loess Plateau, northern China

Laboratory study on the thermal performance of vertical U‐tube ground heat exchanger during short‐term borehole thermal energy storage ( BTES ) and heat extraction process

Seepage mechanisms and permeability differences between loess and paleosols in the critical zone of the Loess Plateau

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