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1、已知H站于1982-1983年连续观测了两年日最大波高资料，试用原始分布方法求多年一遇设计波高。按照下列步骤计算：（1） 先将0.3m以上的日最大波高挑选出来，按照由小到大的顺序列入下表，并统计出表中各栏，表中ln(H-b)的b设置为0。（为什么取0.3m以及b=0这里不做介绍，日最大波高与频率点绘制在对数正态概率纸上呈一直线。）H频数v累计频数pln(H-b)v*ln(H-b)ln(H-b)2v*ln(H-b)20.31561568.6-1.204-187.8201.450226.1300.420035619.7-0.916-183.2580.840167.9180.526161734.1-
2、0.693-180.9110.480125.3980.623184846.8-0.511-118.0010.26160.2780.7163101155.8-0.357-58.1380.12720.7360.8111112262-0.223-24.7690.0505.5270.9173129571.5-0.105-18.2270.0111.9201105140077.300001.156145680.40.0955.3370.0090.5091.252150883.30.1829.4810.0331.7291.3491557860.26212.8560.0693.3731.478163590.3
3、0.33626.2450.1138.8311.525166091.70.40510.1370.1644.1101.635169593.60.47016.4500.2217.7321.716171194.50.5318.4900.2824.5051.822173395.70.58812.9310.3457.6011.910174396.20.6426.4190.4124.120211175496.90.6937.6250.4805.2852.19176397.30.7426.6770.5504.9542.210177397.90.7887.8850.6226.2172.34177798.10.8
4、333.3320.6942.7752.49178698.60.8757.8790.7666.8982.53178998.80.9162.7490.8402.5192.66179599.10.9565.7330.9135.4782.78180399.60.9937.9460.9877.8922.82180599.71.0302.0591.0602.1202.91180699.71.0651.0651.1341.13431180799.81.0991.0991.2071.2073.31180899.81.1941.1941.4251.4253.41180999.91.2241.2241.4981.4983.61181099.91.2811.2811.6411.6417.1118111001.9601.9603.8423.842合计15.151-603.07222.526705.300（2） 统计特征值：本例N=1811，所用资料为两年，（3） 计算50年一遇和100年一遇设计波高根据n=905.5,P=0.98和0.99，查年最大值分布函数表，得到：将已求得的、s和带入，可得50年一遇设计波高100年一遇设计波高：
