分类学可分为以下的不同方式： 1． 人为分类（Artificial classification）是实用主义的分类，以任意的、容易观察的特征如 习性、颜色、数量、形态及类似的特征作为分类依据。
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定义与分类是按照事物的自然和社会的客观属性加以人为的主观界定。
Definition and classification according to the natural and social objective attributes to define subjectively by human.
研究结果表明该方法可在一定程度上降低人为因素对缺陷定性识别的影响，获得较好的缺陷分类效果。
The results show that by this method human effects on qualitative recognition of flaws can be reduced to some extent, and high accuracy of flaw classification can be obtained.
根据突水通道分类，有破碎带水害、滑动构造水害、采动裂隙带水害、人为通道水害等。
There are fractured zone water disaster, glide fracture water disaster, mining cranny water disaster, man-made channels water disaster based on flood water channel classification.
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