Optics and Precision Engineering, Volume. 33, Issue 12, 1971(2025)

Inversion of nearshore lake water turbidity based on photon distribution characteristics from spaceborne lidar

Heng CHEN, Rong HE*, Xiaoling WU, Shuaishuai ZHANG, and Chenchen ZHU
Author Affiliations
  • School of Surveying and Land Information Engineering ,Henan Polytechnic University, Jiaozuo454000, China
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    Figures & Tables(15)
    Overview of the research area and measuring station
    Processing flow chart
    Comparison of photon distributions before and after denoising
    Signal point extraction results under different turbidity
    Feature extraction diagram
    Relationship between photon penetration depth characteristics and turbidity
    Relationship between photon density characteristics and turbidity
    Attenuation rate is approximately derived from the pseudo-waveform
    Random Forest Regression Results
    Time series of turbidity variations
    • Table 1. Location and environmental characteristics of observation stations

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      Table 1. Location and environmental characteristics of observation stations

      测站名称坐标环境特征
      Toledo

      41° 41.6 N,

      83° 28.3 W

      紧邻西南部的底特律河口,周围主要为城市及港口区,有活跃的航运业和制造业,使用测站数据浊度范围为6~49 NTU,平均浊度为27.4 NTU
      Fermi power plant

      41° 57.6 N,

      83° 15.4 W

      周围是高度工业化的区域,周围工业设施包括发电厂、钢铁厂、化工厂等,使用测站数据浊度范围为10~45 NTU,平均浊度为28.3 NTU
      Marblehead

      41° 32.6 N,

      82° 43.9 W

      该区域主要依赖于渔业、旅游业和一些农业活动,春秋季节,渔业活动较为频繁,使用测站浊度数据范围为17~48 NTU,平均浊度为29.4 NTU
      Cleveland

      41° 32.65 N,

      83° 38.1 W

      附近有活跃的海港和铁路交通,周围是重工业和服务业的结合体,使用测站浊度数据范围为21~50 NTU,平均浊度为31.8 NTU
      Fairport

      41° 45.6 N,

      81° 16.9 W

      周围的经济活动主要依赖于渔业、旅游业和小规模的农业,使用测站浊度数据范围为20~55 NTU,平均浊度为33 NTU
    • Table 2. Filter criteria

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      Table 2. Filter criteria

      筛选内容标准
      数据缺失<20%
      湖面水体起伏<0.2 m
      后脉冲现象
      是否冰期
    • Table 3. Photon distribution characteristics at each survey station

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      Table 3. Photon distribution characteristics at each survey station

      测站

      平均浊度/

      NTU

      强轨平均光子密度/(个/km)弱轨平均光子密度/(个/km)强轨平均穿透深度/m弱轨平均穿透深度/m强轨穿透深度平均中值/m
      Toledo27.42 2005700.270.240.21
      Fermi28.332 2905600.250.240.20
      Marblehead29.42 3805800.240.230.18
      Cleveland31.82 4505900.190.180.16
      Fairport332 5206100.170.170.13
    • Table 4. Comparison of retrieval results using different algorithms

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      Table 4. Comparison of retrieval results using different algorithms

      ModelR2MSEMAERMSEMedAE
      RF0.937.152.042.671.69
      MLP0.918.682.272.941.90
      SVM0.928.582.212.921.86
      XGBOOST0.98.762.312.971.93
    • Table 5. Inversion results for different turbidity levels

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      Table 5. Inversion results for different turbidity levels

      ModelR2MSEMAERMSEMedAE
      RF(a)0.875.181.712.271.19
      RF(b)0.809.132.353.021.98
      SVM(a)0.836.772.002.601.53
      SVM(b)0.7610.782.573.282.12
      XGBOOST(a)0.826.852.082.611.85
      XGBOOST(b)0.6416.363.284.052.85
      MLP(a)0.836.792.012.601.54
      MLP(b)0.7610.792.563.282.12
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    Heng CHEN, Rong HE, Xiaoling WU, Shuaishuai ZHANG, Chenchen ZHU. Inversion of nearshore lake water turbidity based on photon distribution characteristics from spaceborne lidar[J]. Optics and Precision Engineering, 2025, 33(12): 1971

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    Paper Information

    Category:

    Received: Mar. 6, 2025

    Accepted: --

    Published Online: Aug. 15, 2025

    The Author Email: Rong HE (hero@hpu.edu.cn)

    DOI:10.37188/OPE.20253312.1971

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