Statistic data were obtained by tests and dissections and the relationships between crack length, width and depth were given as a reference for crack depth evaluation.
通过大量检测试验和解剖，得出统计规律数据，从而得到裂纹长度、宽度与深度之间的对照表，对裂纹深度的评估有一定的参考价值。
And evaluation extreme value method is used to obtain the volute width at the minimum noise.
并用求极值方法得出噪声最小的蜗壳宽度。
Thirdly, according to the research needs, selected gully length, gully width, gully density and vertical slope as the evaluation index.
根据本研究的需要，选取沟道长度、沟道宽度、沟壑密度和纵比降作为分析沟道变化的判别指标。
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