Calculation of the Natural Flow Regulation Coefficient of the Pregel River

Abstract

The average daily expenditure security curves are used to analyze the intra-annual flow distribution of rivers. The share of basic runoff is estimated using the natural flow regulation coefficient (NFRC). The value of NFRC is determined by the graph of the specified curve or another approximate method. The simple Mathcad-method for calculating NFRC is presented in the article. NFRC of The Pregel River over the past 12 years have been calculated. The presence of floods (summer-autumn rain and winter thaw) is a feature of the hydrological regime of the Southern Baltic rivers. The increase in the water content of the Pregel River is mainly due to floods. Flood flows greater than the runoff of spring floods in some years. Therefore, the increase in the water content of the Pregel River does not lead to a decrease in NFRC, as in other rivers in the North-West of Russia.

Natural flow regulation coefficient of the Kaliningrad region rivers

“…According to the table 3 shows that the NFRC of the Pregolya river has a weak stochastic relationship only with Q 30min . This agrees with the conclusions of [8]. All other rivers have a closer NFRC relationship with Q 30min .…”

“…Since 2008, it is possible to obtain such data from the Automated information system for State monitoring of water objects (AIS SMWO) [9]. How to work with the specified Internet resource and download arrays with hydrological information is described in detail in [10]. As of 01.01.2023, data for 2020 inclusive was posted in the AIS SMWO.…”

“…The method for calculating NFRC using modern information technologies was proposed in [8]. The NFRC values of the Pregolya river for 2007-2018 were calculated.…”

“…The purpose of this article is to calculate the NFRC of KR rivers using the previously developed method [8] and analyze its features.…”

Comparison of the minimum discharge of the Instruch river at the beginning of the 20th and 21st century

“…This characteristic is necessary when planning many water management activities (river navigation, reconstruction and reconstruction of water intake structures, operation of irrigation systems, wastewater discharge, etc.). Therefore, a large number of scientific publications have been devoted to the study of the regularities of the formation of MAD [1][2][3][4][5][6].…”