结合机器学习方法的多源观测数据确定丘陵平原地区地下水位

IF 3.2 3区 地球科学 Q1 Environmental Science
Jiahao Li, Chengpeng Lu, Jingya Hu, Yufeng Chen, Jialiang Ma, Jing Chen, Chengcheng Wu, Bo Liu, Longcang Shu
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引用次数: 0

摘要

建立准确、有效地模拟地下水位的模型对水资源管理和含水层保护具有重要意义。要实现这一目标,关键是要识别遥感、地形和气象中的关键因素,并改进水文模型以提高预测精度。本文提出了一种多步建模框架,即RF-PSO-GRNN算法模型,以提高数据稀缺丘陵地区地下水位模拟的精度。该框架将随机森林(RF)模型与粒子群优化(PSO)算法和广义回归神经网络(GRNN)相结合。首先,将研究区划分为丘陵和平原区,平原区平均绝对误差(MAE)降低0.2 m,丘陵区平均绝对误差降低0.1 m。然后利用rf -基尼指数组合计算各区域的贡献因子,从而确定最优平衡策略,使丘陵地区的RMSE降低4.35 m,平原地区的RMSE降低3.82 m。随后,采用粒子群算法计算GRNN的最优平滑因子,进一步将RMSE降低约10 m。此外,丘陵地区MAE下降了11 m,平原地区下降了7.5 m。最后,利用RF-PSO-GRNN模型模拟了江西省富河流域3个县域地下水位的时空演变。研究结果证实了GRNN在有限数据样本下模拟地下水位的有效性。该研究为数据匮乏条件下的水文建模和地下水管理提供了实用的解决方案,有助于理解和预测地下水动态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Determining the Groundwater Level in Hilly and Plain Areas From Multisource Observation Data Combined With a Machine Learning Approach

Determining the Groundwater Level in Hilly and Plain Areas From Multisource Observation Data Combined With a Machine Learning Approach

Developing an accurate model that can effectively simulate groundwater levels is of immense significance for water resource management and aquifer protection. To achieve this, it is crucial to identify key factors in remote sensing, topography, and meteorology, and to improve hydrological models to enhance prediction accuracy. This study proposes a multistep modelling framework, the RF-PSO-GRNN algorithm model, to improve the accuracy of groundwater level simulations in data-scarce hilly regions. The framework combines the random forest (RF) model with the particle swarm optimization (PSO) algorithm and the generalised regression neural network (GRNN). First, the study area was divided into hilly and plain regions, decreasing mean absolute error (MAE) by 0.2 m in plain areas and 0.1 m in hilly areas. The RF-Gini index combination was then used to calculate the contributing factors for each region, facilitating the determination of an optimal balancing strategy, which reduced RMSE by 4.35 m in hilly areas and 3.82 m in plain areas. Subsequently, the PSO algorithm was employed to compute the optimal smoothing factor for GRNN, further reducing RMSE by approximately 10 m. Additionally, MAE decreased by 11 m in hilly areas and 7.5 m in plain areas. Finally, the RF-PSO-GRNN model was applied to simulate the spatiotemporal evolution of groundwater levels in three counties within the Fu River Basin of Jiangxi Province, China. The findings confirm the effectiveness of GRNN in simulating groundwater levels with limited data samples. This study provides a practical solution for hydrological modelling and groundwater management under data-scarce conditions, contributing to the understanding and predicting groundwater dynamics.

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来源期刊
Hydrological Processes
Hydrological Processes 环境科学-水资源
CiteScore
6.00
自引率
12.50%
发文量
313
审稿时长
2-4 weeks
期刊介绍: Hydrological Processes is an international journal that publishes original scientific papers advancing understanding of the mechanisms underlying the movement and storage of water in the environment, and the interaction of water with geological, biogeochemical, atmospheric and ecological systems. Not all papers related to water resources are appropriate for submission to this journal; rather we seek papers that clearly articulate the role(s) of hydrological processes.
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