An improved ET control method to determine the water-saving potential for farmland in Baiyangdian Watershed, China

Abstract

Resource-based water-saving potential has been recognized as the reduction of evapotranspiration and water loss of inefficient irrigation systems. In this paper, an improved evapotranspiration control model is applied to calculate resource-based water-saving potential, considering the influences of effective rainfall (uncontrolled evapotranspiration) and irrigated water (controlled evapotranspiration). Farmland in Baiyangdian Watershed, a highly productive area in northern China, is analyzed to determine the water-saving potential of irrigation processes. The water-saving potential was zero, 163.90 × 10⁶ m³, and 318.24 × 10⁶ m³ in wet, normal, and dry years, respectively, and was greater in years with less rainfall. Under the combined effect of rainfall, crop water consumption, and crop water requirements, the water-saving potential showed obvious temporal and spatial variations. July and August comprised almost 98.6% of the annual potential. In the northeast and southwest corner of the study area, potential approached zero. The potential was 1.53 times greater in the north-central than in the south-central area. The model can furnish the appropriate timing and region to water managers for implementing water-saving strategies.

Keywords

resources-based water-saving potential / evapotranspiration / improved evapotranspiration control model / Baiyangdian Watershed

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Acknowledgements

This research was supported by the National Basic Research Program of China (No. 2010CB951104), the National Water Pollution Control and Treatment Project of China (No. 2008ZX07209-009), and the Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51121003).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg