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Earth and Space Sciences · 术语表

什么是 Cone of depression？

Definition 23.13 University Earth and Space Sciences — Year 3 · 第 23 章 — Hydrogeology

The cone of depression of a pumped well is the depression of the water table, or of the potentiometric surface, round the well; the gradient steepens towards the well, through which all the water must pass.

The Theis cone of the Varden-3 well (Q = 2160\, m3/ d, T = 450\, m2/ d, S = 2 × 10-4), drawdown plotted downward. Left, after 1, 10 and 100 days: the cone deepens by the same amount for every tenfold time and widens without limit in an infinite aquifer. Right, two such wells 400\, m apart after 10 days: the drawdowns add, 5.5\, m midway between them instead of 2.7\, m for one well. — The Theis cone of the Varden-3 well ( $Q = 2160\,\mathrm{m}^{3}/\mathrm{d}$ , $T = 450\,\mathrm{m}^{2}/\mathrm{d}$ , $S = 2 \times 10^{-4}$ ), drawdown plotted downward. Left, after 1, 10 and 100 days: the cone deepens by the same amount for every tenfold time and widens without limit in an infinite aquifer. Right, two such wells $400\,\mathrm{m}$ apart after 10 days: the drawdowns add, $5.5\,\mathrm{m}$ midway between them instead of $2.7\,\mathrm{m}$ for one well.

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