Modulus Ratio Coefficients of Surface Water Resources Quantity in China's Ten First-Level Water Resources Zones (1956—2020)

I. Research BackgroundWith the intensification of climate change and human activity disturbances, the non-consistency characteristics of China's water resources have become increasingly prominent. Accurately identifying the (non-)consistency of water resources series has become a key requirement in hydrological research. This dataset takes China's ten first-level water resources zones as the research object. Through dataset analysis and method comparison, it aims to solve the problem of high misjudgment rate of traditional (in-)consistency test methods and provide reliable data support and method reference for the research on the evolution law of water resources.II. Research Scope and ZonesThis study takes China's ten first-level water resources zones as the spatial scope, including: Southeast River Basin (SER)、Songhua River Basin (SON)、Hai River Basin (HAI)、Huai River Basin (HUA)、Pearl River Basin (PEA)、Northwest River Basin (NWR)、Southwest River Basin (SWR)、Yellow River Basin (YEL)、Liao River Basin (LIA)、Yangtze River Basin (YAN)III. Basic Information of the Dataset1. Time SpanFrom 1956 to 2020, it reflects the interannual changes and evolution trends of surface water resources quantity over the past more than half a century.2. Data Sources and QualityData collection in phases:1956—2000: The cross-section runoff formed by superimposing the synchronous natural runoff of each sub-zone within the first-level zones, derived from the results of the national water resources survey and assessment;2001—2020: Collected from the China Water Resources Bulletin.3. Data ProcessingTo eliminate the differences in the base amount of water resources among different zones and focus on the "relative change characteristics", the original surface water resources quantity data have been uniformly converted into modulus ratio coefficients (calculated as "annual water resources quantity/series mean value", which can intuitively reflect the interannual fluctuation degree of water resources quantity and the extent of deviation from the average level).4. Related AchievementsFor detailed research information, please refer to the supporting paper:Hydrological (in)consistency test based on correlation coefficients by Niu Jingyi et al.The (in)consistency characteristics of surface water resources quantity in the ten first-level water resources zones can be divided into two categories:(1) Consistent zones: Southeastern Rivers Region, Yangtze River Region, Huaihe River Region, Pearl River Region, and Southwestern Rivers Region, which generally conform to the consistency law;(2) Inconsistent zones: Songhua River Region, Haihe River Region, Northwestern Rivers Region, Liaohe River Region, and Yellow River Region, which show significant inconsistency characteristics.Combined with the analysis of the natural and social backgrounds of the zones, the main driving factors of the inconsistency characteristics include:Climate change: Such as changes in glacial meltwater caused by rising temperatures in the Northwestern Rivers Region, and changes in precipitation patterns in the Haihe River Region;Human activities: Such as the construction of water conservancy projects in the Songhua River Region, the development and utilization of water resources in the Yellow River Region, and the increase in urbanization and agricultural irrigation water use in the Haihe River Region.