Scientific Bulletin of Politehnica University of Timişoara

Transactions on HYDROTECHNICS

Volume 62(76), Issue 1, 2017

Advance hydraulic modeling of irrigation channel Temesit, in irrigation system Teba – Timisat,

Beilicci Robert1 Beilicci Erika1

Abstract: Study case is situated in irrigation system cadastral territories Foieni, Giulvăz, Peciu Nou , Teba - Timisat. To solve theoretical problems of Sanmihaiu Roman and Sag in the localities falling movement of water in the channel Temeșiț, it requires perimeter system: Cruceni Foieni, Ionel, , modeling of water flow in this case. Numerical modeling Ivanda, Sinmartinu Sarbesc, Sinmartinu Maghiar, was performed using the program MIKE11. Advanced computational modules are included for description of Sînmihaiu Roman partially Dinias. flow over hydraulic structures, including possibilities to describe structure operation. The input data are: area Irrigation system Teba - Timisat has a total area plan with location of cross sections; cross sections of 28,063 ha, is located in interfluves TIMIŞ - BEGA topographical data and roughness of river bed; flood downstream of Timisoara, the basin of the rivers discharge hydrograph. After simulation with MIKE 11 Timis and Bega, is limited to the north of Bega result the water level in each cross sections. navigable channel to the west of Serbia, south Timis Key words: Hydraulic modeling, irrigation channel river and drainage systems Rudna - Giulvăz and

Caraci and east system Sag - Topolovăţ. 1. INTRODUCTION

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C 1 / S 1 P CR C UC T S P ENI 7/1 C I 7 order to adjust its moisture, creating appropriate T C IM .T r conditions for making timely farming operations, with positive effects on production. Figure 1. Irrigation system Teba – Timisat To achieve this goal were achieved partly works and drainage ditches in the area of 28 063 ha in Teba- The level of groundwater in the area is Timisat drainage system, as follows: influenced by several factors, namely: - Main collector drain arrangement (regulation - Change the channel levels Bega and Timis Timisat, Teba, Temesit) and connection of large river; channels or valleys extending the length of 65 km; - Precipitation on surfaces located in the - Completion of drainage works by thickening upstream side of the perimeter of the system and deepening the existing channel network in an area (planning); of 22213 ha; - Rainfall in the period from October to May - New network of drainage channels on an area each year. of 5,850 ha; Hydrogeological zoning made prior to execution, - Closed horizontal drainage works cross type on based on observations made during the period 1973 - an area of 285 ha, located in a high groundwater level 1984 drilling IMH network and IEELIF existence trough north of town Ionel. field highlighted areas related to groundwater depths From the administrative point of view, the intervals as follows: drainage system Teba - Timisat is located in the - 0.5-1.0 m: 974 ha western part of Timis County, including related land - 1.0-1.5 m 4643 ha

1 Politehnica University Timisoara, Faculty of Civil Engineering, Department of Hydrotecnnics, Timisoara, Str. George Enescu, no. 1/A, Timisoara, Romania, www.ct.upt.ro, [email protected] 9

- 1.5-2.0 m: 7406 ha - Average yearly rainfall 639 mm and 540.4 mm - 2.0-3.0 m: 9873 ha station to station Timisoara evil; - 3926 m over 3 ha - Amplitude precipitation: 350-400 mm in dry Following raionării maximum levels recorded in years or 500-850 mm in wet years; the same period, it appeared that the perimeter, 78% - Duration excess moisture in dry years 5 of the area in the spring has deep phreatic level at 0 - months; 1.00 m. - Duration excess moisture in wet years: 7-8 Groundwater flow direction is oriented NE - SW months; with average gradient of 0.3%. General natural slope of the land is northeast to Excess moisture in the arrangement Thebes - southwest, being a 0.2-3%. Timis appear differently on surfaces varying Emissaries vacating the main river waters are depending on the orographic, soil and local navigable Timis and Bega channel. Timis River hydrogeological comes from rainfall and groundwater gravitational allow downloads of inland waters in perimeter fueled partly navigable channel Bega. about 70% of days of average, and for about 131 days Climatic factors that influence the excess during the growing season. moisture situation were analyzed for Timisoara resort and partialy Dinias-Rauti points, resulting in:

Figure 2 Longitudinal profiles in chanel Temesit

Typical levels in Timis river discharge in the 1 S1,5+y main section SP Cruceni are: Q = i (4) n P0,5+y - 5% = 80.00 mdMB level (Q = 880 m / s) By replacing Manning relationship is obtained: - 1% = 80.75 mdMB level (Q = 1200 m / s) 5 - 0.3% = 81.30 mdMB level (Q = 1400 m / s) 1 S 3 Q = i (5) - Share dig = 81.43 mdMB canopy. n 2 In terms of chemical groundwater presents a P 3 mineralization of 0.53 to 5.73 gr / l. For the particular case of trapezoidal section is The concentration of salts is lower near noted that the area (S) and the wetted perimeter (P) permanent water courses in the area, Bega and Timis. can be expressed as: In the Dinias - Sanmartinu Sarbesc, Ivanda, S = bh+ mh2 = β + mh2 (6) appear mineralization of 4.3 to 5.73 g. / L, which also 2  2  led to secondary soil salinization. P = b+2 1+ m h =  β +2 1+ m h (7)   2. MATERIAL AND METHODS Resulting in replacement: 1 β + m 1,5+y Q = h2,5+y i (8) Movement of water in canals, rivers or partially n 1,5+y β + m' filled pipes are examples of free level movements.  Uniform motion is done free level canals, straight and where the m' were noted: prismatic (canals, galleries, gutters, ditches, etc.). m' = 2 1+ m2 (9) Free level uniform motion is made in white artificial Numerical modelling was performed using the straight and prismatic (canals, galleries, gutters, program MIKE11. MIKE 11 is a professional ditches, etc.). Analytical solutions are obtained by engineering software package for the simulation of hydraulic calculation formulas Chezy type by flows, water quality and sediment transport in substitutions with Manning relationship with general estuaries, rivers, irrigation systems, channels and equations. other water bodies. MIKE 11 is a user-friendly, fully In general, technical applications currently are dynamic, one-dimensional modelling tool for the using Chezy formula type: detailed analysis, design, management and operation V = C Ri (1) of both simple and complex river and channel Associating continuity equation is obtained for systems. With its exceptional flexibility, speed and flow: user friendly environment, MIKE 11 provides a Q = VS = SC Ri (2) complete and effective design environment for engineering, water resources, water quality Hydraulic radius is explicit and obtain management and planning applications. 3 The Hydrodynamic (HD) module is the nucleus S S 2 Q = SC i  C i (3) of the MIKE 11 modelling system and forms the basis P P for most modules including Flood Forecasting, Associating Chezy formula is obtained for flow: 10

Advection-Dispersion, Water Quality and Non- Numerical modelling was performed with the cohesive sediment transport modules. The MIKE 11 program MIKE11. Initially modelled the existing HD module solves the vertically integrated situation with trapezoidal channel. Site plan in this equations for the conservation of continuity and situation is shown in Figure 5. Cross sections through momentum, i.e. the Saint Venant equations. the channel as topographical surveys are shown in Applications related to the MIKE 11 HD module Figure 6. include: - Flood forecasting and reservoir operation - Simulation of flood control measures - Operation of irrigation and surface drainage systems - Design of channel systems - Tidal and storm surge studies in rivers and estuaries

3. RESULTS AND DISCUSSIONS

Based on these theoretical foundations analytical calculations were performed for proposed pipeline and the existing channel. Topographic studies for existing channel result input the following data: Figure 5 Plan view with the network model b = 3,5 m m = 2,5 i = 0,000216 n = 0,023 The construction curve Q = Q (h) is presented in Figure 3:

Figure 6 Cross sections

Figure 3 The construction curve Q = Q (h) According to data entry or formulated boundary conditions, namely the upstream inflow at chainage The volume of water that can be stored in the 2571,95 are time variant inflow (Figure 7) and in the channel is determined by the relationship: downstream at chainage 0 curve key for downstream V  (b  m  h)  h  Lcanal (10) section of the channel. After running the program L 2572m the length of the channel is MIKE11 was obtained through existing channel canal longitudinal profile, presenting water levels along the designed channel (Figure 8). Respectively calculate the volume of water that can be stored in the drainage channel for different water depths curve was drawn next channel. The construction curve V = V (h) is presented in Figure 4:

Figure 4 The construction curve Q = Q (h)

Figure 7 Time variant inflow. 11

This study presents the application of a 1- MIKE 11 is the preferred choice of professional dimensional unsteady flow hydraulic model used for river engineers when reliability, versatility, the simulation of flow in rivers: the MIKE 11 model productivity and quality are the keywords. from the Danish Hydraulic Institute (DHI).

Figure 8 Longitudinal profile

ACKNOWLEDGMENT This publication [communication] reflects the views only of the author, and the Commission cannot be held responsible for any use which may be made of the information contained therein.

REFERENCES This paper can be possible thanks to project: Development of knowledge centers for life-long [1] F.M., Henderson, (1966). Open Channel Flow. MacMillan Company, New York, USA. learning by involving of specialists and decision [2] I., David, Hydraulic I and II, Polytechnic Institute Traian Vuia Timisoara, Romania, 1984 makers in flood risk management using advanced [3] *** Archive ANIF, 2016 hydroinformatic tools, AGREEMENT NO LLP- [4] *** Mike 11 User Guide, Danmark, pp 1-542, 2012.

LdV-ToI-2011-RO-002/2011-1-RO1-LEO05-5329. This project has been funded with support from the European Commission.

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