Regularities of territorial distribution of river runoff in the Zhaiyk-Caspian water basin
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DOI:
https://doi.org/10.32523/2616-6771-2025-151-2-183-196Keywords:
Zhaiyk-Caspian basin, unstudied rivers, hydrologically homogeneous area, regional dependencies, flow modulus map, isolinesAbstract
In hydrological terms, the Zhaiyk-Caspian water basin is considered to be one of the least studied regions. It is characterized by the short duration of observations at most hydrological stations and their uneven spatial distribution. Half of the hydrological stations in the basin have observation records of no more than ten years, and one-third have no more than five years. Additionally, the basin contains a significant number of unstudied small rivers and ravines that are not tributaries of the monitored rivers. Under these conditions, estimating the runoff norm for poorly studied and unstudied rivers becomes one of the most challenging tasks in hydrology. To determine the runoff norm of poorly studied and unstudied rivers in the Zhayik-Caspian basin, the article employed a regional dependence of the runoff modulus on catchment area: M₀ = f(F). Eight regional curves were developed, characterizing hydrologically homogeneous areas of the basin. Analyzing spatial patterns in river runoff distribution enabled the construction of a runoff modulus map. Runoff modulus isolines were drawn within a range of 0.1 to 3.0 l/s/km². The distribution of the runoff modulus generally reflects the zonal variation in climatic conditions from north to south and also accounts for the relief and characteristics of the underlying surface. These results allow us to make it possible to calculate runoff norms for rivers not covered by observations and serve as a basis for water use planning, development of environmental standards, and water management measures under changing climate conditions. The study's results are of high practical significance and can be recommended for application in hydrological calculations, design of water bodies, and formation of regional water policy.
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