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CNSW 1.0: Prefectural Reconstruction of China's Surface Water Resources Using Machine Learning Methods.

Qichen Wang1, Fubo Zhao2, Xi Wang1

  • 1Institute of Global Environmental Change, Xi'an Jiaotong University, Xi'an, Shaanxi Province, 710049, China.

Scientific Data
|June 19, 2025
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Summary
This summary is machine-generated.

China now has its first long-term dataset of prefectural surface water resources (CNSW 1.0) from 2000-2020. This crucial data aids water management and climate change adaptation strategies.

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Area of Science:

  • Hydrology
  • Environmental Science
  • Data Science

Background:

  • Effective water resource management in China requires comprehensive, long-term prefectural surface water data.
  • Existing datasets lack the necessary long-term coverage and accuracy for China's administrative levels.
  • A significant data gap hinders informed water resource strategies and climate change impact assessments.

Purpose of the Study:

  • To develop the first comprehensive, long-term dataset of prefectural surface water resources in China (CNSW 1.0) covering the period 2000-2020.
  • To address the critical data gap for water resource management at the administrative level.
  • To provide a reliable data foundation for climate change adaptation strategies in China.

Main Methods:

  • Utilized official water resources bulletin data for surface water resources.
  • Employed 14 advanced machine learning models for data reconstruction.
  • Validated dataset accuracy using R-squared values and bias assessment.

Main Results:

  • Developed CNSW 1.0, the first long-term (2000-2020) prefectural surface water resource dataset for China.
  • Achieved high accuracy with an R-squared of 0.98 for total surface water resources.
  • Demonstrated superior simulation accuracy and spatial distribution compared to existing datasets (CNRD v1.0, GRUN, ISIMIP).

Conclusions:

  • CNSW 1.0 successfully fills a critical data gap for China's water resources.
  • The dataset's high accuracy and long-term coverage make it invaluable for water management.
  • CNSW 1.0 is essential for informed water resource strategies, especially concerning climate change impacts.