基于人工神经网络的河流水系泥沙流模拟

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Tushar Khankhoje, Parthasarathi Choudhury
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引用次数: 0

摘要

泥沙会导致航行、农业生产力和水污染等问题。河段泥沙流动是一个非线性的复杂过程,研究河段泥沙流动对解决这些问题至关重要。人工神经网络(ANN)在这类问题中的应用有待进一步研究。对于河流水系的非定常流动,河段蓄水量是数据驱动模型中需要考虑的重要变量。然而,以往的泥沙模型研究并没有像本文所研究的那样,在这些模型中明确地使用存储变量。在当前的研究中,存储变量已被明确地(模型2)用于使用人工神经网络从时刻t的输入状态预测系统在时刻t + 1的输出状态。美国密西西比河水系6个测量站的输沙量被认为是状态变量。该模型与考虑河流系统存储参数隐式变化的模型(模型1)进行了比较。动态人工神经网络用于时间序列数据集,更适合纳入数据集中的顺序信息。聚焦记忆神经网络已被用于当前的研究。隐藏层和隐藏节点的数量、激活函数和学习率逐步变化,以获得最优的人工神经网络配置。最佳选择的投入产出变量是模型2中使用的变量,因为它在Nash-Sutcliffe效率系数(CE)值方面的表现略好于其他模型。使用归一化均方根误差(NRMSE)和CE对模型性能进行评估,结果令人满意。NRMSE为<除Venedy和Murphysboro地点外,所有产出均为10%,泥沙负荷的CE值为>除Murphysboro外,所有地点均为0.45,表明两种型号的性能均可接受。这些模型被证明是高效的(CE >0.80,即非常好的预测值),以可接受的精度预测主河道位置的输沙量(CE >0.45),其他地点和河流系统的蓄水量变化。这些模型可用于与泥沙有关的问题的实时预报和管理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
River system sediment flow modeling using artificial neural networks

Sediment leads to problems with navigation, agricultural productivity, and water pollution. The study of sediment flow in river reaches, which is a non-linear and complex process, is, thus, essential to addressing these issues. The application of artificial neural networks (ANN) to such problems needs to be investigated. For unsteady flow in a river system, river reach storage is an important variable that needs to be considered in data-driven models. However, previous research on sediment modeling did not involve the explicit use of storage variables in such models as is investigated in the current study. In the current study, storage variables have been explicitly (Model 2) used to predict the output state of the system at time ‘t + 1’ from the input state at time ‘t’ using ANNs. Sediment discharge at six gaging stations on the Mississippi River system, USA, has been considered as the state variable. The model has been compared with a model considering implicit variation of the storage parameter in the river system (Model 1). Dynamic ANNs are used for time-series datasets, which are more suitable for incorporating the sequential information within the dataset. Focussed gamma memory neural networks have been used in the current study. The numbers of hidden layers and hidden nodes, activation function, and learning rate have been varied step by step to obtain the optimal ANN configurations. The best selected input–output variables are those used in Model 2 as it performed slightly better than the other model in terms of Nash–Sutcliffe efficiency coefficient (CE) values. Model performance evaluated using normalized root mean square error (NRMSE) and CE shows satisfactory results. NRMSE was < 10% for all the outputs except for the Venedy and Murphysboro locations and CE values for sediment loads were > 0.45 for all locations except Murphysboro indicating acceptable performance by both the models. The models proved highly efficient (CE > 0.80, i.e., very good predictions) for predicting sediment discharge at locations along the main river channel with acceptable accuracy (CE > 0.45) for other locations and the storage change for the river system. These models can be used for real-time forecasting and management of sediment-related problems.

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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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