水位异常形态一律为上升型或突升型，不存在下降型；
The anomalous forms of groundwater level are entirely ascending type or abrupt rise tape, without descending type.
来水量增多而河道比降变小，造成局部洪峰水位异常壅高。
Increasing of water and decreasing of gradient of channels, the flood water level rose abnormally in some local sections of river.
结果表明：模糊数学从属函数方法是提取水位异常的较好方法。
Our results show that the subordinate function method can be used to identify the anomaly of groundwater level changes.
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