Journal of Geo-information Science, Volume. 22, Issue 3, 505(2020)

A Parallel Method of Surface Flow Dynamics Simulation based on CUDA

Qianjiao WU and Yumin CHEN*
Author Affiliations
  • School of Resource and Environment Science, Wuhan University, Wuhan 430079, China
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    Figures & Tables(15)
    Model of the threads by the CUDA
    Transmission mode of data during the parallelization process based on CUDA
    Partition model of thread during the parallelization process based on CUDA
    Test DEM of the BBW
    TINs on the sub-region under different thresholds
    Flow pathnetworks on the sub-region under different scales of the rainfall points (threshold is 0.5m)
    Comparison of the simulated results at the BBW's outlet
    Speed ratio under different scales of the rainfall points
    Nash coefficient distribution map of simulation results
    Correlation coefficient distribution map of simulation results
    Balance coefficient distribution map of simulation results
    • Table 1. The accuracy of TIN under different thresholds on the BBW

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      Table 1. The accuracy of TIN under different thresholds on the BBW

      阈值/m0.51.01.52.02.5
      特征点数量/个10 859429521491268822
      TIN表面三角面的数量/个23 34811 079685451394285
      RMSE/m0.170.310.450.580.73
    • Table 2. Accuracy comparison of simulating the flow discharge at the outlet of the BBW

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      Table 2. Accuracy comparison of simulating the flow discharge at the outlet of the BBW

      阈值/m算法模型降雨源点尺度/m
      1015202530
      0.5基于TIN的地表水动态模拟算法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.301.311.311.301.30
      基于CUDA的地表水动态模拟并行方法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.301.311.311.301.30
      1.0基于TIN的地表水动态模拟算法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.311.311.31
      基于CUDA的地表水动态模拟并行方法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.311.311.31
      1.5基于TIN的地表水动态模拟算法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.321.321.31
      基于CUDA的地表水动态模拟并行方法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.321.321.31
      2.0基于TIN的地表水动态模拟算法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.321.311.321.31
      基于CUDA的地表水动态模拟并行方法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.321.311.321.31
      2.5基于TIN的地表水动态模拟算法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.321.321.32
      基于CUDA的地表水动态模拟并行方法N0.770.770.770.770.77
      R0.910.910.910.910.91
      B1.311.311.321.321.32
    • Table 3. Statistical factors utilized to assess the precision of SWAT model (scale of DEM is 30 m)

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      Table 3. Statistical factors utilized to assess the precision of SWAT model (scale of DEM is 30 m)

      评价参数
      NRB
      SWAT0.410.870.96
    • Table 4. Computation performance of simulating the flow discharge at the outlet of the BBW (s)

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      Table 4. Computation performance of simulating the flow discharge at the outlet of the BBW (s)

      阈值/m算法降雨源点尺度/m
      1015202530
      0.5基于TIN的地表水动态模拟算法953.82425.37278.18213.77169.77
      基于CUDA的地表水动态模拟并行方法93.1643.4928.3422.7219.00
      1.0基于TIN的地表水动态模拟算法912.16407.40278.21203.25159.87
      基于CUDA的地表水动态模拟并行方法86.3242.7527.7221.2318.47
      1.5基于TIN的地表水动态模拟算法899.07395.99267.96196.33159.60
      基于CUDA的地表水动态模拟并行方法80.5141.8827.2320.7417.88
      2.0基于TIN的地表水动态模拟算法893.92396.22270.80198.07159.21
      基于CUDA的地表水动态模拟并行方法86.1443.8628.0121.3917.95
      2.5基于TIN的地表水动态模拟算法892.59400.38260.40199.60164.56
      基于CUDA的地表水动态模拟并行方法85.6143.6027.7720.8017.29
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    Qianjiao WU, Yumin CHEN. A Parallel Method of Surface Flow Dynamics Simulation based on CUDA[J]. Journal of Geo-information Science, 2020, 22(3): 505

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    Paper Information

    Received: Sep. 6, 2019

    Accepted: --

    Published Online: Sep. 16, 2020

    The Author Email: CHEN Yumin (ymchen@whu.edu.cn)

    DOI:10.12082/dqxxkx.2020.190500

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