A changepoint approach to modelling non-stationary soil moisture dynamics
用变点方法刻画非平稳土壤水分动态AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要明确研究非平稳时间序列及干燥过程的结构变点,方法对应时间序列与结构变化方向,但应用对象是土壤水分。
用变点方法刻画非平稳土壤水分动态AI 解读 ↓
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Soil moisture dynamics provide an indicator of soil health that scientists model via drydown curves. The typical modelling process requires the soil moisture time series to be manually separated into drydown segments and then exponential decay models are fitted to them independently. Sensor development over recent years means that experiments that were previously conducted over a few field campaigns can now be scaled to months or years at a higher sampling rate. To better meet the challenge of increasing data size, this paper proposes a novel changepoint-based approach to automatically identify structural changes in the soil drying process and simultaneously estimate the drydown parameters that are of interest to soil scientists. A simulation study is carried out to demonstrate the performance of the method in detecting changes and retrieving model parameters. Practical aspects of the method such as adding covariates and penalty learning are discussed. The method is applied to hourly soil moisture time series from the NEON data portal to investigate the temporal dynamics of soil moisture drydown. We recover known relationships previously identified manually, alongside delivering new insights into the temporal variability across soil types and locations.