Application of Evaporation Method Using Two Tensiometers for Determining Unsaturated Hydraulic Conductivity beyond Tensiometric Range
- Авторлар: Fujimaki H.1, Yanagawa A.2
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Мекемелер:
- Arid Land Research Center, Tottori University
- Environmental Systems and Engineering, School of Science and Engineering, MEISEI University
- Шығарылым: Том 52, № 4 (2019)
- Беттер: 405-413
- Бөлім: Soil Physics
- URL: https://journals.rcsi.science/1064-2293/article/view/224968
- DOI: https://doi.org/10.1134/S1064229319040069
- ID: 224968
Дәйексөз келтіру
Аннотация
Accurate determination of unsaturated hydraulic conductivity in low pressure head range is critical for predicting evaporation rate under localized irrigation or root water uptake under drought stress conditions. We proposed a relatively low cost and fast laboratory method to simultaneously determine water retention and hydraulic conductivity functions across a wide range of pressure heads. The method is quite similar to conventional evaporation method using two tensiometers. In addition to tensiometer readings, the proposed method uses water content profile at the end and cumulative evaporation. Experimental results for three soils with different textures showed that inversely optimized hydraulic conductivity functions agreed with K-data measured with the steady state evaporation method, indicating the reliability of the proposed method. The hydraulic conductivity functions fitted for K-data obtained by tensiometer readings with Campbell’s K(θ) function also agreed well with the reference K-data for two of the three soils, but largely deviated from those for the third soil. This indicates the importance of actual measurement of K(θ) in low pressure head range.
Негізгі сөздер
Авторлар туралы
H. Fujimaki
Arid Land Research Center, Tottori University
Email: fujimaki@tottori-u.ac.jp
Жапония, Tottori, 680-0001
A. Yanagawa
Environmental Systems and Engineering, School of Science and Engineering, MEISEI University
Хат алмасуға жауапты Автор.
Email: fujimaki@tottori-u.ac.jp
Жапония, Hino, Tokyo, 191-8506