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Combination of discrete element method and artificial neural network for predicting porosity of gravel-bed river
Water (Switzerland) Số 7, năm 2019 (Tập 11, trang -)
DOI: 10.3390/w11071461
Tài liệu thuộc danh mục: ISI, Scopus
English
English
Từ khóa: Ecosystems; Finite difference method; Forecasting; Grain size and shape; Gravel; Mathematical models; Porosity; Rivers; Size distribution; Bed porosity; Fluvial geomorphology; Grain size distribution; Gravel-bed rivers; Porosity changes; Porosity predictions; Reliable results; River ecosystem; Feedforward neural networks; algorithm; artificial neural network; digital elevation model; discrete element method; fluvial geomorphology; grain size; gravel bed stream; infiltration; modeling; prediction; simulation; size distribution
Tóm tắt tiếng anh
In gravel-bed rivers, monitoring porosity is vital for fluvial geomorphology assessment as well as in river ecosystem management. Conventional porosity prediction methods are restricting in terms of the number of considered factors and are also time-consuming. We present a framework, the combination of the Discrete Element Method (DEM) and Artificial Neural Network (ANN), to study the relationship between porosity and the grain size distribution. DEM was applied to simulate the 3D structure of the packing gravel-bed and fine sediment infiltration processes under various forces. The results of the DEMsimulations were verified with the experimental data of porosity and fine sediment distribution. Further, an algorithm was developed for calculating high-resolution results of porosity and grain size distribution in vertical and horizontal directions from the DEM results, which were applied to develop a Feed Forward Neural Network (FNN) to predict bed porosity based on grain size distribution. The reliable results of DEM simulation and FNN prediction confirm that our framework is successful in predicting porosity change of gravel-bed. � 2019 by the authors.
