Hydrologic Non-Stationarity: Types, Drivers, Detection Methods, & Practical Tips
Understanding non-stationarity is becoming essential in modern hydrological modelling and flood risk assessment. Traditional rainfall–runoff models assume that hydrological processes are stationary, meaning their statistical properties remain constant over time. However, due to climate change, land use change, and water resources development, this assumption is increasingly being challenged.
In this video, I explain what non-stationarity means in the context of rainfall–runoff modelling, why it matters, how to detect it, and what engineers can do to address it in practice.
Also, watch other channel videos on rainfall-runoff modelling:
Types of Rainfall–Runoff Models Explained | Processes, Space, Time, and Uncertainty
• Types of Rainfall–Runoff Models Explained ...
Rainfall-Runoff Model Calibration & Validation | Fixing Common Mistakes
• Rainfall-Runoff Model Calibration & Valida...
Equifinality in Hydrological Modelling: The Calibration Uncertainty Guide
• Equifinality in Hydrological Modelling: Th...
Design Storm vs Design Flood – Key Differences & Common Mistakes Explained
• Design Storm vs Design Flood – Key Differe...
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⏱️ Timestamps
00:00 Introduction
00:32 What is stationarity and why it matters
01:10 Types of non-stationarity
• Trend non-stationarity
• Shift (change-point) non-stationarity
• Variance non-stationarity
• Distributional changes
• Covariance non-stationarity
01:59 Drivers of non-stationarity
• Climate change impacts
• Land use and urbanisation
• Water resources development (dams, abstraction)
02:54 Methods to detect non-stationarity
03:32 Best practices and recommendations
04:10 Key takeaways
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🎓 What you will learn
• What non-stationarity means in hydrology
• Different types of non-stationary behaviour
• Key drivers of change in rainfall–runoff systems
• How to detect non-stationarity in data
• Practical strategies for modelling and design under changing conditions
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🔎 Keywords
#nonstationarity #hydrologicalmodelling #hydrologytutorial #floodmodelling #rainfallrunoffmodel #climatechange #urbanization #civilengineering #floodrisk #uncertainty #landusechange #waterresourcemanagement