Evaluation of a static water balance model in cropped and grazed systems of temperate Australia

Article

Melland, Alice R., Vigiak, Olga, Roberts, Anna M., Rattray, Dan and Whitford, Jane. 2010. "Evaluation of a static water balance model in cropped and grazed systems of temperate Australia." Environmental Modelling and Software. 25 (12), pp. 1682-1691. https://doi.org/10.1016/j.envsoft.2010.05.006
Article Title

Evaluation of a static water balance model in cropped and grazed systems of temperate Australia

ERA Journal ID4673
Article CategoryArticle
AuthorsMelland, Alice R. (Author), Vigiak, Olga (Author), Roberts, Anna M. (Author), Rattray, Dan (Author) and Whitford, Jane (Author)
Journal TitleEnvironmental Modelling and Software
Journal Citation25 (12), pp. 1682-1691
Number of Pages10
Year2010
PublisherElsevier
Place of PublicationOxford, United Kingdom
ISSN1364-8152
1873-6726
Digital Object Identifier (DOI)https://doi.org/10.1016/j.envsoft.2010.05.006
Web Address (URL)http://www.sciencedirect.com/science/article/pii/S136481521000160X
Abstract

Several water balance models have been developed for Australian conditions, however few of them were developed for the mixed cropping and grazing systems that are typical of temperate south-east Australia. HowLeaky? is a 1-dimensional water balance model that allows simulation of both cropped and grazed systems. This study tested the accuracy of HowLeaky? simulations of soil moisture content and surplus water (runoff plus deep drainage) for mixed farming systems in south-east Australia. Two datasets from the state of Victoria were used to validate model simulations: 1) Rutherglen, consisting of four years soil moisture observations and deep drainage estimates from seven treatments of crop rotations and annual pasture; 2) Vasey, consisting of three years soil moisture and runoff observations and deep drainage estimates from a perennial pasture. A static plant growth option was applied to simulate seasonal crop and pasture covers. Despite the static approach not accounting for inter-annual variation in crop development, HowLeaky? captured observed soil moisture trends, with the Nash Sutcliffe efficiency ranging from fair (0.34) in continuous crop, moderate (0.64–0.68) in annual and perennial pasture, to very good (>0.70) for continuous lucerne and lucerne-crop rotations. Annual water surplus was generally underestimated in this uncalibrated application of the model suggesting a need for some degree of model calibration for highly uncertain and influential parameters such as field capacity.

KeywordsHowLeaky?; PERFECT; soil water content; drainage; pasture; lucerne; crop
ANZSRC Field of Research 2020300201. Agricultural hydrology
409901. Agricultural engineering
300406. Crop and pasture improvement (incl. selection and breeding)
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Byline AffiliationsTeagasc Agriculture and Food Development Authority, Ireland
Department of Primary Industries, Victoria
Tree Crop Technologies, Australia
Institution of OriginUniversity of Southern Queensland
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