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29INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 1 ISSUE 8 UIF-2022: 8.2 | ISSN: 2181-3337
IMPROVING RIVER SEDIMENT DISTRIBUTION CALCULATION IN MOUNTAIN
RIVERS Akhmedov Islombek
Dosent of Namangan Engineering-Construction Institute
Khamidov Adhamjon Professor of Namangan Engineering-Construction Institute
Kholmirzayev Sattor Professor of Namangan Engineering-Construction Institute
Yusupov Shavkat Teacher of Namangan Engineering-Construction Institute
Umarov Isroiljon Teacher of Namangan Engineering-Construction Institute https://doi.org/10.5281/zenodo.7447564
Abstract. The article describes the improvement of the calculation of river sediments based on the data obtained in natural field studies.
Keywords: River, sediment, bedload, deformation, chanel, bank СОВЕРШЕНСТВОВАНИЕ РАСЧЕТА РАСПРЕДЕЛЕНИЯ НАСАДОВ В ГОРНЫХ
РЕКАХ
Аннотация. В статье описано усовершенствование расчета речных наносов на основе данных, полученных в натурных полевых исследованиях.
Ключевые слова: Река, наносы, донный наносы, деформация, русло, берег
INTRODUCTION
One of the important issues is the improvement of computational methods and technologies for the assessment of processes in the riverbed and prediction of the deformation of the riverbed. In this regard, special attention is paid to the scientific research works aimed at improving the technologies for preventing silting of hydrotechnical structures in the river bed and canal.
The processes in the river basin and the dynamics of the distribution of river sediments are an integral process. Deformation changes occurring in the river bed and channel bed directly depend on the amount, composition and distribution dynamics of sediments.
This year, the data obtained on erosion and accumulative processes in the Sokhsoy basin located in the Sokh river basin under natural field conditions were analyzed.
RESEARCH MATERIALS AND METHODOLOGY
The influence of sediments on changes in the structure's hydraulic elements has been studied for many years [1,2,3,4,5]. Some progress has been made in this direction. However, despite this, the problems of analyzing the mechanical composition of sediments and determining the characteristics of sediments have not been fully solved [6,7,8,9,10]. It is necessary to carry out research on the study of the mechanical composition of bottom sediments in mountain rivers and to evaluate their influence on river bed formation.
In natural field research, studies on the amount and composition of sediments were conducted in several pickets in the Sokhsoy basin, which receives water from the Sarikurgon hydroelectric station.
INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 1 ISSUE 8 UIF-2022: 8.2 | ISSN: 2181-3337
In order to determine the amount of turbidity, the amount of sediments, and the fractional composition of the Sokhsoy basin, samples of water and sediments were taken at several pickets. In the research conducted on the obtained samples, the amount of sediments, changes in the
Efeo
70 60 50 40 30 20 10 0
I III I h
6 S
31.07.2018 v-16.08.2018 V-19.OS.2018 v25.08.2018 y30.08.2018 y. 2.09.2018 y. 6.09.2018 y.
fractional composition along the length of the well and other hydraulic parameters were studied, and information was obtained about the distribution of sediments by pickets (Fig. 1).
Fig. 1 PK-12 Graph of the dependence of the amount of turbidity on water consumption
The grain composition of the sediments obtained in the natural field studies in the Sokhsoy basin according to the pickets (Fig. 2) is presented.During periods of low water consumption, sediment movement is almost imperceptible. In times of high water consumption, measurement is complicated due to the high flow rate. The peculiarity of Sokhsoy, which is considered as a research object, is that water flows in this river only at certain times. This research can be considered as a laboratory plot under natural field conditions.
P %
100,0 90,0 80,0 70,0 60,0 50,0 40,0 30,0 20,0 10,0 , 0,0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
nK-32 -■—nK-72 ÏÏK-12 nK-92 nK-82 nK-52 —I—nK-22
-nK-62
-nK-96
d mm
Figure 2. The graph of the grain composition of the sediments in the Sokhsoy basin
INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 1 ISSUE 8 UIF-2022: 8.2 | ISSN: 2181-3337
RESULTS OF THE STUDY
On the basis of the data collected in the natural field conditions in the Sokhsoy basin, the consumption of bottom sediments was analyzed on the basis of several available calculation formulas.
The average values of the data obtained in natural field conditions are presented in the table below (Table 1).
Table 1
Н, m i d, mm Q, m3/s
1,1 0.01 0.0055 60
Here: H - the average depth of the water flow, i - the slope of the river bed, d - the average diameter of the sediment particle, Q - average water consumption. According to G.I. Shamov formula, bottom sediment consumption and initial speed are determined as follows.
q = к
3
л3
average
3
V initial J
3
average initial A jj
V H у
(1)
k - coefficient depending on the composition of the sediment particle. 3 = 4,4d1/3 H1/6
average ?
According to the formula of I.I. Levi, the consumption of the bottom sediment and the initial speed are determined as follows.
Here: 3average - average spee^ fyrntial - initial speed
q = 0,002
3
V Г Л "N 0 25
- 3 i-
average initial A jj
(3
av
(2)
(3)
3average = 3,2л/^ lg
H_ Id
Below is the calculation of sediment consumption and initial velocity determination (Tables 2, 3).
Table 2.
Calculation of bottom sediment consumption
№ The author Formula Result m2/s
1 G. I. Shamov (3 Л q = к average 3 V initial у 3 s J N0,25 (3 Sri-1 V average initial А тт V H у 0,0003
2 I.I. Levi (3 q = 0,002 avpg V V gd "l3 /л Л 0,25 (3 -3 J-1 V average initial д jj V H J 0,0098
Table 3. initial speed calculation
№ The author Формула Result
INTERNATIONAL SCIENTIFIC JOURNAL VOLUME 1 ISSUE 8 UIF-2022: 8.2 | ISSN: 2181-3337
m/s
1 G. I. Shamov 3 = 4,4d1/3 H1/6 average ? 0,61
2 I.I. Levi 3lmüal = lgH 7d 0,59
CONCLUSION
It is necessary to improve the hydrological and hydraulic conditions of each region when
using the proposed formulas for determining the consumption of bottom sediments.
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