Izvestiya Rossiiskoi akademii nauk. Seriya geograficheskayaIzvestiya Rossiiskoi akademii nauk. Seriya geograficheskaya2587-5566The Russian Academy of Sciences1436210.31857/S2587-55662019398-104Original ArticleMethodology of calculation the maximum flow rate of suspended sediments of mudflows (within Nakhchivan Autonomous Republic)MammadovJ. H.jumamamedov@yahoo.comInstitute of Geography, Azerbaijan National Academy of Sciences250620193981042506201925062019Copyright © 2019, Russian academy of sciences2019<p>The main natural factors that have a significant impact on the maximum flow rate of suspended sediments are identified. The most universal of these factors is the maximum water flow rate, which creates an opportunity for the formation and development of mudflow processes, as well as determines the power of the mudflow. As a rule, the maximum flow rate of suspended sediments increases with increasing catchment area. At the same time, the larger the size of a river basin is, the greater the impact of various physical and geographical factors. Such complex factors include: Qmax the maximum water flow rate, the coefficient of natural over regulation of rivers, the index of ploughness, the forest cover index, İ the slope of the catchment area. These factors are closely interrelated and interdependent, as mudflows are, to a certain extent, a mirror reflecting the influence of the main natural and anthropogenic factors. It seems to us that of the above factors determining the general background, the most universal ones are singled out for calculating the maximum flow rate of suspended sediments. We believe that there should also be a link between the values of the maximum flow rate of suspended sediments and the set of parameters that more clearly reflect the influence of natural factors. In this regard, in individual basins of any territory mudflows appear with different capacity. The relationships between the maximum flow rate of suspended sediments and the complex of natural factors reflect hydrological and geological-geomorphological conditions. Horizontal and vertical differentiation of mountain slopes with different exposures allowed us to identify this dependence in the form of 3 equations. The first two equations characterize the increase of maximum flow of suspended sediments in watershed and plowed slopes that lead to the maximum flow rate of suspended sediments. But forest cover and the coefficient of rivers flood natural overregulation lead to the lowest flow rate of suspended sediments. The third equation is characterized by the largest increase in water flow rate and in the average height of the catchment, which increases the maximum flow rate of suspended sediments, and the catchment area and the natural over regulation of rivers leads to its reduce.</p>maximum suspended sedimentsmaximum water flow ratemudflowswater flowreliefprecipitationнаибольший расход водыселевые потокирельефатмосферные осадки[Abasov M.A. Geomorfologiya Nakhichevanskoi ASSR [Geomorphology of the Nakhichevan ASSR]. Baku: Elm Publ., 1970. 149 p.][Azizbekov Sh.A. Geologiya Nakhichevanskoi ASSR [Geology of the Nakhichevan ASSR]. Moscow: Gosgeoltekhizdat Publ., 1961. 502 p.][Dedkov A.P., Boiko, F.F., Mozzherin V.I., Chasovnikova E.A. Anthropogenic change in the system of exogenous processes of relief-formation in the middle Volga region. In Rel'ef i khozyaistvennaya deyatel'nost' cheloveka [Relief and Human Economic Activities]. Moscow, 1982, pp. 20–28. (In Russ.).][Velikanov M.A. Oshibki izmereniya i empiricheskie zavisimosti [Measurement Errors and Empirical Relations]. Leningrad: Gidrometeoizdat Publ., 1962. 302 p.][Vinogradov Y.B. Etyudy o selevykh potokakh [Studies on Debris Flows]. Leningrad: Gidrometeoizdat Publ., 1980. 143 p.][Kavetskaya G.G. Air temperature. In Klimat Azerbaidzhana [The Climate of Azerbaijan]. Baku: Akad. Nauk Azerb. SSR, 1968, pp. 90–120. (In Russ.).][Katalog seleopasnykh rek Azerbaidzhana [Directory of mudflow dangerous rivers of Azerbaijan]. Baku: Nauchn.-Issled. Inst. Gidrometeorol. Natsional'nogo Gidrometeorol. Departamenta Ministerstva Ekol. Prir. Resur., 2008. 104 p.][Kritskii S.N., Menkel M.F. On the main methods of maximum runoff calculation. Tr. GGI, 1968, no. 102, pp. 3–17. (In Russ.).][Mamedov D.G. The main factors affecting the formation of mudflows and their use in developing methods of calculation most of the costs of water and suspended sediments, as well as their variability (within the Greater Caucasus of the Republic of Azerbaijan). Geogr. Vestn., 2013, vol. 3, no. 26, pp. 67–77. (In Russ.).][Mamedov M.A. Raschety maksimal'nykh raskhodov vody gornykh rek [Calculations of Maximum Water Flow in Mountain Rivers]. Leningrad: Gidrometeoizdat Publ., 1989. 184 p.][Podobedov N.S. Obshchaya fizicheskaya geografiya i geomorfologiya [General Physical Geography and Geomorphology]. Moscow: Nedra Publ., 1974. 312 p.][Kherkheulidze I.I. Empirical formulas for the approximate determination of the parameters of structural debris flows. In Mater. V Vsesoyuznogo soveshchaniya po izucheniyu selevykh potokov i mer bor'by s nimi [Materials of V All-Union Conf. on the Study of Debris Flows and Measures to Combat Them]. Baku: Akad. Nauk Azerb. SSR, 1962, pp. 178–184. (In Russ.).][Shamov G.I. Rechnye nanosy [River Sediments]. Leningrad: Gidrometeoizdat Publ., 1959. 378 p.][Shikhlinski E.M. Atmospheric precipitation. In Klimat Azerbaidzhana [The Climate of Azerbaijan]. Baku: Akad. Nauk Azerb. SSR, 1968, pp. 152–207. (In Russ.).]