Characterizing the heterogeneity of karst critical zone and its hydrological function:an integrated approach

Chen, Xi and Zhang, Zhicai and Soulsby, Chris and Cheng, Qinbo and Binley, Andrew Mark and Jiang, Rui and Tao, Min (2018) Characterizing the heterogeneity of karst critical zone and its hydrological function:an integrated approach. Hydrological Processes, 32 (19). pp. 2932-2946. ISSN 0885-6087

[img]
Preview
PDF (Chen et al (author copy))
Chen_et_al_author_copy_.pdf - Accepted Version
Available under License Creative Commons Attribution-NonCommercial.

Download (2MB)

Abstract

Spatial heterogeneity in the subsurface of karst environments is high, as evidenced by the multi‐phase porosity of carbonate rocks and complex landform features that result in marked variability of hydrological processes in space and time. This includes complex exchange of various flows (e.g. fast conduit flows and slow fracture flows) in different locations. Here, we integrate various “state‐of‐the‐art” methods to understand the structure and function of this poorly‐constrained critical zone environment. Geophysical, hydrometric and tracer tools are used to characterize the hydrological functions of the cockpit karst critical zone in the small catchment of Chenqi, Guizhou province, China. Geophysical surveys, using electrical resistivity tomography (ERT), inferred the spatial heterogeneity of permeability in the epikarst and underlying aquifer. Water tables in depression wells in valley bottom areas, as well as discharge from springs on steeper hillslopes and at the catchment outlet, showed different hydrodynamic responses to storm event rainwater recharge and hillslope flows. Tracer studies using water temperatures and stable water isotopes (δD and δ18O) could be used alongside insights into aquifer permeability from ERT surveys to explain site‐ and depth‐dependent variability in the groundwater response in terms of the degree to which “new” water from storm rainfall recharges and mixes with “old” pre‐event water in karst aquifers. This integrated approach reveals spatial structure in the karst critical zone and provides a conceptual framework of hydrological functions across spatial and temporal scales.

Item Type:
Journal Article
Journal or Publication Title:
Hydrological Processes
Additional Information:
This is the peer reviewed version of the following article: Chen X, Zhang Z, Soulsby C, et al. Characterizing the heterogeneity of karst critical zone and its hydrological function: An integrated approach. Hydrological Processes. 2018;32:2932–2946. https://doi.org/10.1002/hyp.13232 which has been published in final form at http://onlinelibrary.wiley.com/doi/10.1002/hyp.13232/abstract This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2300/2312
Subjects:
ID Code:
126767
Deposited By:
Deposited On:
07 Aug 2018 08:54
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Sep 2020 04:22