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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >EFFECTS OF GEOTHERMAL INDUCED SUBSIDENCE
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EFFECTS OF GEOTHERMAL INDUCED SUBSIDENCE

机译：地热诱导的沉降作用

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摘要

Subsidence is a consequence of large scale geothermal development, although the magnitude varies greatly between fields. Subsidence is not unique to geothermal fields: it is common where fluids (oil or water) are drawn from aquifers. The greatest subsidence (measured by both area affected and cost of mitigation) arises from withdrawal of groundwater for irrigation or municipal use. Geothermal subsidence can be substantial - many metres - but generally has little practical consequence. Wairakei maximum subsidence is about 15 m, but the effects are relatively slight, whereas much less subsidence at Ohaaki means that the Waikato River may inundate adjacent land and structures. Although the subsidence may be relatively large (tens or hundreds of millimetres per year) because it occurs over distances of kilometres, specialised survey techniques are required to measure it accurately.
机译：沉降是大规模地热开发的结果，尽管场之间的大小差异很大。沉降并不是地热田独有的：从含水层中抽取流体（油或水）的情况很普遍。最大的沉降（由受影响的面积和缓解的成本来衡量）来自于灌溉或市政用水的抽取。地热沉陷可能很严重-很多米-但通常几乎没有实际后果。怀拉基最大下沉约为15 m，但影响相对较小，而Ohaaki的下沉要少得多，这意味着怀卡托河可能淹没邻近的土地和建筑物。尽管由于沉降发生在千米的距离上，所以沉降可能相对较大（每年数十或数百毫米），但仍需要专业的测量技术来准确地对其进行测量。

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