Small-Watershed Debris Flow Early Warning Using Water Storage
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Solution Overview
Problem
Existing debris flow monitoring and early warning systems in small watersheds rely on precipitation indicators, which are constrained by rainfall process uncertainties, leading to low forecasting accuracy and lack of consideration for catchment and storage characteristics, making it difficult to effectively monitor and prevent debris flows.
Innovation Solution
A method using a GR4J hydrological model calibrated by rainfall, evaporation, and runoff data to establish a water storage model as a key indicator for debris flow monitoring, combined with a minimum debris flow initiation critical flow calculation, and an improved GR4J model incorporating geological parameters for dynamic updates, to provide real-time monitoring and early warning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If precipitation indicators are used for debris flow monitoring, then the monitoring system can be established, but the forecasting accuracy is low due to rainfall process uncertainties
Solution Approach 1:
The patent changes the monitoring parameter from precipitation indicators to water storage indicators. By using the GR4J hydrological model to calculate water storage dynamics based on rainfall, evaporation, and runoff data, the system transforms the monitoring approach to reflect actual watershed conditions more accurately, thereby improving forecasting accuracy while accounting for catchment and storage characteristics.
Solution Approach 2:
The patent introduces a hydrological model (GR4J) as an intermediary between precipitation data and debris flow prediction. This model processes rainfall, evaporation, and runoff data to compute water storage indicators, which serve as a more reliable intermediate parameter that captures the complex interactions within the watershed system.
2Adaptability or versatility
If precipitation indicators are used for debris flow monitoring, then the monitoring system can be established, but catchment and storage characteristics are not considered
Solution Approach 1:
The patent changes the monitoring parameter from precipitation indicators to water storage indicators. By using the GR4J hydrological model to calculate water storage dynamics based on rainfall, evaporation, and runoff data, the system transforms the monitoring approach to reflect actual watershed conditions more accurately, thereby improving forecasting accuracy while accounting for catchment and storage characteristics.
3Measurement precision
If water storage model is used for monitoring, then the forecasting accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent employs the GR4J hydrological model, which is a multi-functional tool capable of processing rainfall, evaporation, and runoff data to compute water storage indicators. This universal model framework reduces the need for multiple separate monitoring systems while maintaining high measurement precision.
Solution Approach 2:
The hydrological model operates autonomously by processing available meteorological and hydrological data to generate water storage indicators. The system self-calibrates and adapts to watershed characteristics without requiring complex manual configuration or intervention, thereby reducing operational complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the accuracy of debris flow monitoring and early warning by using water storage as a monitoring threshold, allowing for more precise evaluation and disaster reduction through increased water output and drainage measures, thereby improving the watershed's disaster tolerance capacity.
Implementation Method 1
the process of its runoff and confluence movements is a physical process that can be simulated by a hydrological process
Implementation Method 2
evaporation, rainfall, and runoff data
Implementation Method 3
surface runoff caused by rainfall in small watersheds
Implementation Method 4
constructing, using the GR4J hydrological model, a water storage S model of the target watershed
Implementation Method 5
deploying monitoring devices to collect real-time environmental monitoring data, the environmental monitoring data including evaporation, rainfall, and runoff data
Data Source
AI summary
An early warning method for debris flow disaster in a small watershed, and a disaster reduction method for debris flows in a small watershed is disclosed. An early warning method for debris flow disaster in a small watershed is provided, in which parameters of a hydrological model are calibrated by rainfall, evaporation and runoff data of the watershed based on water balance of the watershed, and an early monitoring and warning scheme for debris flows, which takes water storage in the watershed as a core monitoring and evaluation indicator, is established. The GR4J hydrological model is improved by taking into account a watershed area, specific yield of an aquifer and several geological parameters, as well as an evapotranspiration effect of vegetation. A disaster reduction method by means of regulation of a drainage channel can provide a basis for mathematical model simulation studies of disaster reduction in small watersheds.