Application of Digital Twin Technology in Water Pipeline Leak Detection: A Comparative Study of Machine Learning and Deep Learning Models

This article introduces the GitHub open-source project Digital-Twin-for-Water-Network-Leak-Detection, which is based on the digital twin concept. It uses the LeakDB dataset to compare the performance of three models—Random Forest, LSTM, and CNN-LSTM—in water pipeline leak detection, providing technical references for smart water management construction.

Urban water supply pipeline leakage is a major challenge for the global water industry, with leakage rates in developing countries as high as 30% to 50%. Traditional manual inspection and pressure monitoring are inefficient. The development of the Internet of Things (IoT) and machine learning has promoted intelligent leak detection, and digital twin technology provides a new path for leak detection by building a virtual mirror of physical systems.

The goal of this open-source project is to realize automatic leak identification using machine learning/deep learning technologies based on the LeakDB dataset, integrating multi-dimensional sensor data with the digital twin concept. The LeakDB dataset contains pressure, flow, and demand data from different leak scenarios. Technically, three models are compared:

1. Random Forest: An ensemble learning model with fast training and strong interpretability, used as the baseline model;
2. LSTM: A recurrent neural network that captures temporal dependencies, suitable for dynamic pressure changes;
3. CNN-LSTM: A hybrid model that combines CNN for local feature extraction and LSTM for temporal modeling. Feature engineering is carried out around three types of data: pressure, demand, and flow. Preprocessing includes missing value handling, normalization, etc.

Comparison of the three models: Random Forest is suitable for rapid prototyping and feature analysis but has limitations in capturing temporal sequences; LSTM can model time dependencies but requires high hyperparameter tuning; CNN-LSTM has the best performance but high computational cost. Different models are suitable for different scenarios: Random Forest can be selected for real-time monitoring, and deep learning models can be selected for offline analysis.

This project provides a reusable solution for smart water management. The combination of digital twin and machine learning promotes the transformation of pipeline management towards intelligence. Actual deployment can reduce leakage rates, optimize maintenance costs, improve service quality, and support decision-making.

Data quality is the key to model success, and actual deployment needs to deal with noise in real scenarios. Model selection needs to balance performance, efficiency, and interpretability. Digital twin is a system engineering thinking, and edge computing and 5G will promote the application of real-time digital twins in the infrastructure field.