python -- 计算有效波高、平均波高

通过python计算有效波高，平均波高，平均周期，有效周期

现有波面数据如下图所示，采用频率为20Hz，需要根据波面数据计算得到平均波高、有效波高等信息。

python代码如下所示，绘图部分仅展示了概率分布：

# -*- coding: utf-8 -*-
"""
Created on %(date)s

@author: %(jixianpu)s

Email : 211311040008@hhu.edu.cn

introduction : keep learning althongh walk slowly
"""

import matplotlib.pyplot as plt
import pandas as pd

import numpy as np
path=r'D:/data.xlsx'

data=pd.read_excel(path)

high=data['波面数据(m)']

da=np.array(high)

da=da
a=[]
for i in range(len(da)-1):
    if (da[i]<0)&(da[i+1]>0):
        print(i)
        a.append(i)
wh=[]
tm=[]
for j in range(len(a)-1):
    
    x=da[a[j]:a[j+1]]
    
    x_max=np.max(x)
    x_min=np.min(x)
    
    h=x_max-x_min
    
    t=a[j+1]-a[j]
    
    tr=0.05*t
    tm.append(tr)
    wh.append(h)


### mean time \mean wave high            
h_mean=np.mean(wh)
t_mean=np.mean(tm)


### 
h_s=sorted(wh,reverse=True)
hs_3=h_s[0:int(len(h_s)/3)+1]
hs3_mean=np.mean((hs_3))

t_s=sorted(tm,reverse=True)
ts_3=t_s[0:int(len(h_s)/3)+1]
ts3_mean=np.mean(ts_3)
   

####f
hist, x, y= np.histogram2d(wh,tm,bins=10)
############################################################################
fig=plt.figure(figsize=(10,10))
ax = fig.add_subplot(111)

# ax.plot(da[0:1000])

# plt.axhline(y=0, color='r', linestyle='--')
ax.imshow(hist)
ax.set_xlabel('H(m)',fontsize=20)
ax.set_ylabel('T(s)',fontsize=20)
ax.set_ylim(0,10)
ax.pcolor(hist)
# ax.bar(x,y)
plt.show()
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