Next Article in Journal
A New Device for Pressure Control and Energy Recovery in Water Distribution Networks
Previous Article in Journal
Using Remote Sensing Data to Parameterize Ice Jam Modeling for a Northern Inland Delta
Article Menu
Issue 5 (May) cover image

Export Article

Open AccessArticle
Water 2017, 9(5), 307; doi:10.3390/w9050307

Dynamics of Water Vapor Content around Isolated Sprinklers: Description and Validation of Model

Research Center for Grassland Ecology and Resources, Beijing Forestry University, No. 35 Tsinghua East Road, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Ashok K. Chapagain
Received: 8 February 2017 / Revised: 13 April 2017 / Accepted: 24 April 2017 / Published: 27 April 2017
View Full-Text   |   Download PDF [2010 KB, uploaded 27 April 2017]   |  

Abstract

Irrigation consumes considerable water to satisfy the current food demand. An improvement in water use efficiency for irrigation is essential. Wind drift and evaporation losses reduce the water use efficiency of center pivot irrigation systems in arid and semi-arid areas. In this paper, a model of water vapor dynamics during and after overhead sprinkler irrigation was developed and validated by experimental data using a center pivot simulator and a water vapor measuring system. The model was represented as an exponential equation during irrigation and a logistic equation after irrigation. The water vapor dynamics measured next to and 2 m from the sprinkler were well-fitted with the developed model. Model performance was good according to evaluations of the Nash—Sutcliffe efficiency coefficient, with values of 0.961 and 0.934 for estimations next to the sprinkler and 2 m from the sprinkler, respectively. Results showed that both modeled and observed water vapor dynamics increased rapidly as irrigation started, and then leveled off to maximum values. After irrigation, the water vapor dynamics started to decrease gradually, and eventually decreased rapidly. The decreasing rate stopped when the water vapor content was restored to the level of the surrounding atmosphere. The model parameters showed that the maximum increases in water vapor content were from 2.506 to 6.476 g m−3 for the area next to the sprinkler, and 1.277 to 3.380 g m−3 for the area 2 m from the sprinkler, under the influence of vapor pressure deficits. The increasing and decreasing rates of the dynamics during and after irrigation were influenced by temperature, relative humidity, and vapor pressure deficits, according to Pearson’s correlations. A period of 2.3 to 4.0 h was required to restore water vapor to the atmospheric level. View Full-Text
Keywords: sprinkler irrigation; wind vapor dynamics; dynamic model; evaporation losses sprinkler irrigation; wind vapor dynamics; dynamic model; evaporation losses
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Jiao, J.; Su, D.; Wang, Y. Dynamics of Water Vapor Content around Isolated Sprinklers: Description and Validation of Model. Water 2017, 9, 307.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Water EISSN 2073-4441 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top