泥石流沟综合评判的数学基础
（1）河沟的评判总得分N模型：
N=A+B+C
A=
B=
C=
J=1,2,3,4
式中，A为地貌因素得分；B为河沟因素得分；C为地质因素得分；i为各因素项目；j为类目。
（2）综合评判别条件模型：
严重：N≥N1
中等：N1>N≥N2
轻微：N2>N≥N3
没有：N3>N
式中，
N1=
（
ai1+
bi1+
ci1+
ai2+
bi2+
ci2），
N2=
[(
ai2+
bi2+
ci2）+（
ai3+
bi3+
ci3）],
N3=
[(
ai3+
bi3+
ci3）+（
ai4+
bi4+
ci4）],
谭炳炎：泥石流沟严重程度的数量化综合评判。水土保持通报，1986,1（29）
Debris flow refers to the mountainous or other valleys of deep valleys, terrain in steep areas, because of heavy rain, Blizzard or other natural disasters caused by landslides and carrying a large number of sediment and the special torrent of stones. Debris flow with a sudden and fast flow, flow, material capacity and destructive power and so on. Occurrence of debris flow often washed away highway and other transport facilities and even villages and towns, resulting in huge losses.
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