Relationship Between Unit Area Discharge of Artesian Groundwater and Land Subsidence

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Other Title
  • 被圧地下水の単位面積排水量と地盤沈下との関係

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Abstract

Unit area discharge of groundwater, Z (m3/day/km2) can be expressed by the following equation, <BR>Z=n/AQ<BR>where Q is the average discharge (l/sec) of well or spring, A is the area (km2) of the surrounding terrain having the same hydro-geologic condition at the well site. n/A is called the coefficient of well distribution or of spring distribution.<BR>This paper deals with the calculation of Z values for Tokai and Chugoku-Shikoku districts with the amount of free groundwater and with that of artesian groundwater. The Z values of artesian groundwater in those districts were plotted on the inter-section chart, Z-Q-n/A diagram, with reference to several well-known land subsidence area. On the diagram, the regression equation based on the method of least squares for 10 sites in the spring area is as follows:<BR>logZ=0.772logQ+2.357<BR>and that for 4 sites in the land subsidence area is<BR>logZ=0.890logQ+2.617<BR>The value of n/A in the land subsidence area was high as 2.5-4. This result suggests that the land subsidence might be due to the overdraft of artesian groundwater rather than that of free groundwater.

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Details 詳細情報について

  • CRID
    1390282679071376384
  • NII Article ID
    110003356231
  • NII Book ID
    AN00026635
  • DOI
    10.5110/jjseg.19.1
  • ISSN
    18840973
    02867737
  • Text Lang
    ja
  • Data Source
    • JaLC
    • Crossref
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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