An approach for simulating the hydraulic performance of irrigation laterals
Tóm tắt
A new method for simulating lateral hydraulics in laminar or turbulent flow has been developed. The outflow is considered as a discrete variable and the friction head losses are calculated using the Darcy–Weisbach equation with an equivalent friction factor. Local head losses are also computed by applying equivalent coefficients that can be dependent on Reynolds number. Considering these premises, a compact expression that is valid for any type of regime has been deduced for calculating global head losses along any lateral stretch. The proposed method is useful to workout the hydraulic computation of laterals with the inlet segment at full or fractional outlet spacing, and complex laterals when a different pipeline diameter, slope, flow regime or emitter gap have to be considered.
Tài liệu tham khảo
Agüera J (1996) Mecánica de fluidos incompresibles y turbomáquinas hidráulicas. Ciencia 3, Madrid
Anwar AA (2000) Adjusted average correction factors for sprinkler laterals. J Irrig Drain Eng ASCE 126(5):296–303
Berlamont J, Van der Beken, A (1973) Solutions for lateral outflow in perforated conduits. J Hydraul Div ASCE 99 (HY9):1531–1549
Bralts VF et al (1993) Finite element analysis of microirrigation hydraulics using a virtual emitter system. Trans ASAE 36(3):717–725
Finkel HJ (1982) CRC handbook of irrigation technology, vol 1. CRC press, Boca Raton
Hathoot HM et al (1993) Analysis and design of trickle irrigation laterals. J Irrig Drain Eng ASCE 119(5):756–767
Hathoot HM et al (1994) Analysis and design of sprinkler irrigation laterals. J Irrig Drain Eng ASCE 120(3):534–549
Juana L et al (2002) Determining minor head losses in drip irrigation laterals I: methodology. J Irrig Drain Eng ASCE 128(6):376–384
Juana L et al (2004) Analytical relationships for designing rectangular drip irrigation units. J Irrig Drain Eng ASCE 130(1):47–59
Kang Y, Nishiyama S (1995) Hydraulic analysis of microirrigation submain units. Trans ASAE 38(5):1377–1384
Kang Y, Nishiyama S (1996) A simplified method for design of microirrigation laterals. Trans ASAE 39(5):1681–1687
Miller DS (1990) Internal flow systems. BHRA, Cranfield
Scaloppi EJ, Allen RG (1993) Hydraulics of irrigation laterals: comparative analysis. J Irrig Drain Eng ASCE 119(1):91–115
Valiantzas JD (1998) Analytical approach for direct drip lateral hydraulic calculation. J Irrig Drain Eng ASCE 124(6):300–305
Valiantzas JD (2002a) Continuos outflow variation along irrigation laterals: effect of the number of outlets. J Irrig Drain Eng ASCE 128(1):34–42
Valiantzas JD (2002b) Hydraulic analysis and optimum design of multidiameter irrigation laterals. J Irrig Drain Eng ASCE 128(2):78–86
Valiantzas JD (2005) Modified Hazen–Williams and Darcy–Weisbach equations for friction and local head losses along irrigation laterals. J Irrig Drain Eng ASCE 131(4):342–350
Vallesquino P (2004) Modelos de simulación en ramales de riego. Dissertation, University of Córdoba, Spain. Available via DIALOG. http://perso.wanadoo.es/es2valap/index.htm. Cited 3 December 2004
Vallesquino P, Luque-Escamilla PL (2001) New algorithm for hydraulic calculation in irrigation laterals. J Irrig Drain Eng ASCE 127(4):254–260
Vallesquino P, Luque-Escamilla PL (2002) Equivalent friction factor method for hydraulic calculation in irrigation laterals. J Irrig Drain Eng ASCE 128(5):278–286
Villemonte JR (1977) Some basic concepts on flow in branching conduits. J Hydraulics Division ASCE 103(HY7):685–697
Ward-Smith AJ (1980) Internal fluid flow. Oxford University Press, Oxford
Warrick AW, Yitayew M (1988) Trickle lateral hydraulics. I: analytical solution. J Irrig Drain Eng ASCE 114(2):281–288
Wu I-P (1992) Energy gradient line approach for direct hydraulic calculation in drip irrigation design. Irrig Sci 13:21–29