Results 251 to 260 of about 464,387 (271)

Simple Method for Estimating Pan Coefficients: Conversion of Pan Evaporation to Reference Evapotranspiration

Journal of Irrigation and Drainage Engineering, 2012
Reference evapotranspiration rates are often estimated by using pan evaporation data because pan data are widely available.
Khil-Ha Lee, Hong-Yeon Cho
openaire   +1 more source

Developing crop coefficients and pan coefficient for greenhouse-grown tomato under drip irrigation

2013 Kansas City, Missouri, July 21 - July 24, 2013, 2013
Abstract Because of the special environment in the greenhouse and the partial wetting character of drip irrigation, the water requirement of crop was difficult to estimate or measure accurately. Water requirement of drip irrigated tomato grown in a solar-heated greenhouse in North China Plain was determined using a water balance method in this ...
null Weixia Zhao, null Jiusheng Li, null Zhen Wang, null PhD Student, null Yanfeng Li, null PhD, null Engineer   +6 more
openaire   +1 more source

Pan coefficient (K p) estimation under uncertainty on fetch

Meteorology and Atmospheric Physics, 2012
The FAO Penman–Monteith (F-PM) method is a frequently applied approach for calculating the daily reference evapotranspiration (ET0). This method requires long records of meteorological data, which makes it quite hard to employ in locations with no or limited available data. Evaporation pans are widely used to estimate the reference ET0, but this method
M. Mohammadi, B. Ghahraman, K. Davary, A. M. Liaghat, M. Bannayan   +4 more
openaire   +1 more source

Development of pan coefficients for estimating evapotranspiration from riparian woody vegetation

Hydrological Processes, 2013
AbstractThe long‐term ‘Millennium Drought’ has put significant pressure on water resources across Australia. In southeastern Australia and in particular the Murray‐Darling Basin, removal of exotic, high‐water‐use Salix trees may provide a means to return water to the environment. This paper describes a simple model to estimate evapotranspiration of two
Doody, T., Benyon, R., Theiveyanathan, S., Koul, V., Stewart, L.   +4 more
openaire   +2 more sources

Determination of plant-pan coefficients for field-grown eggplant (Solanum melongena L.) using class A pan evaporation values

Agricultural Water Management, 2006
Abstract This study was conducted to determine the most suitable plant-pan coefficient for eggplant, using pan evaporation values, in field conditions. Application of irrigation water was based on cumulative class A pan evaporation within the irrigation intervals. Irrigation treatments consisted of one irrigation interval ( I 1: 7 day) and five plant-
Ertek, Ahmet, Sensoy, Suat, Kucukyumuk, Cenk, Gedik, Ibrahim   +3 more
openaire   +3 more sources

OPTIMIZATION OF FLOW COEFFICIENT FOR PAN CHECK VALVE BY FLUID DYNAMIC ANALYSIS

AIP Conference Proceedings, 2010
This paper describes the optimization of flow coefficient for pan check valve by computational fluid dynamic analysis. This work is focused on determine the length of supporting beam by pressure drop analysis and evaluate flow coefficient. And then in case of optimum design of pan check valve, predict flow head loss with different flow rate.
Joon-Ho Lee, Xue-Guan Song, San-Mo Kang, Young-Chul Park, Nader Barsoum, G. W. Weber, Pandian Vasant   +6 more
openaire   +1 more source

Evaluation of pan coefficient for reference crop evapotranspiration for semi-arid region

Irrigation Science, 2007
Pan coefficient (Kpan) is the important factor for computation of reference evapotranspiration (ETo) from pan evaporation (Epan). In this paper, the approaches proposed by Cuenca (Irrigation system design: an engineering approach. Prentice-Hall, Englewood Cliffs, 1989), Snyder (J Irrig Drain Eng 118(6):977–980, 1992), Orang (Potential accuracy of the ...
H. G. Gundekar, U. M. Khodke, S. Sarkar, R. K. Rai   +3 more
openaire   +1 more source

Investigating the conversion coefficients for free water surface evaporation of different evaporation pans

Hydrological Processes, 2004
AbstractThe conversion coefficients of free water surface evaporation were investigated. Comparisons were made between numerous evaporation tanks (pans) and a 20 m2 evaporation tank. Based on 6 years of evaporation data collected at Nansihu Lake Evaporation Station in Shandong Province, China, the following results have been obtained. First, conversion
Guobin Fu, Changming Liu, Shulin Chen, Jialian Hong   +3 more
openaire   +1 more source

Crop and pan coefficients for saffron in a semi-arid region of Iran

Journal of Arid Environments, 2008
Abstract Saffron (Crocus sativus L.) is an important prennial crop planted in Iran. The growing period of saffron is mostly winter and spring, which makes it a popular crop in areas with limited water supply. Crop coefficients, Kc (the ratio of crop potential evapotranspiration (ETcp) to reference crop evapotranspiration (ETo) of saffron are needed ...
A. Azizi-Zohan, A.A. Kamgar-Haghighi, A.R. Sepaskhah   +2 more
openaire   +1 more source

Research on the influence of secondary mirror shadow coefficient upon Pan-Cassegrain system

SPIE Proceedings, 2006
Pan-Cassegrain (PC) system is a new structure, which originates from the classical Cassegrain system. The most important character of the PC system is that a 4th order aspherical surface, which can be manufactured by using the spherical fabrication technology, is added in front of the primary spherical mirror.
Chao-Ming Li, Jun-Hua Pan
openaire   +1 more source