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water dynamics under Drip Irrigation to Proper Manage water Use in Arid Zone

Journal of Agricultural Chemistry and Environment 2021年第1期10卷 57-68页

作者： Siguibnoma Kevin Landry Ouédraogo Marcel Bawindsom Kébré Francois Zougmoré Laboratoire de Matériaux et Environnement Université Joseph KI-ZERBO Ouagadougou Burkina Faso

The water resources reduction due to climate changes and also population increase, have contributed to increasing the constraint on water disponibility and accessibility. In the agricultural field, we need moderate soil and water resources management. This work aims to simulate water dynamics in soil under drip irrigation system in arid regions to better manage irrigation water. Simulations are done with soil physical properties of Burkina Faso. We assess maize plant water requirements for the whole growing season. With Hydrus 2D, we simulate water supply in the soil column. We assign atmospheric conditions on the top of the domain, zero flux of water on the lateral sides, and free drainage on the bottom boundary domain. We perform many irrigation events to analyze wetting pattern distribution around the emitter, which allowed us to contain the amount of irrigation water applied, only around the area dominated by roots, and then reduce water losses that roots cannot uptake. According to the different growing stages of the maize crop, we choose proper irrigation duration and frequency, and suggest irrigation schedule for the whole growing season.

关键词： Drip Irrigation water dynamics Hydrus (2D/3D) water

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Relationship between sand-dust weather and water dynamics of desert areas in the middle reaches of Heihe River

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Research in Cold and Arid Regions 2016年第6期8卷 516-523页

作者： Yun Niu XianDe Liu Xin Li YanQiang Wei Hu Zhang XiaoYan Li Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China Academy of Ecology Science of Zhangye Gansu Science and Technology Innovation Service Platform of Ecology in Qilian Mountains Gansu Province Zhangye Gansu 734000 China Academy of water Resource Conservation Forests of Qilian Mountains in Gansu Province Test Station of Desertification Control in Hongshawo Zhangye Gansu 734000 China

Sand-dust weather has become an international social-environmental issue of common concern, and constitutes a serious threat to human lives and economic development. In order to explore the responses of natural desert sand and dust to the dynamics of water in desertification, we extracted long-term monitoring data related to precipitation, soil water, groundwater, and sand-dust weather. These data originated from the test stations for desertification control in desert areas of the middle reaches of the Heihe River. We used an algorithm of characteristic parameters, correlations, and multiple regression analysis to establish a regression model for the duration of sand-dust weather. The response char-acteristics of the natural desert sand and dust and changes of the water inter-annual and annual variance were also examined. Our results showed：（1） From 2006 to 2014 the frequency, duration, and volatility trends of sand-dust weather obviously increased, but the change amplitudes of precipitation, soil water, and groundwater level grew smaller. （2） In the vegetative growth seasons from March to November, the annual variance rates of the soil moisture content in each of four studied layers of soil samples were similar, and the changes in the frequency and duration of sand-dust weather were similar. （3） Our new regression equation for the duration of sand-dust weather passed the R test, F test, and t test. By this regression model we could predict the duration of sand-dust weather with an accuracy of 42.9%. This study can thus provide technological support and reference data for water resource management and re-search regarding sand-dust weather mechanisms.

关键词： sand-dust weather water dynamics regression model middle reaches of the Heihe River

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Terahertz spectroscopy of water in nonionic reverse micelles

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Chinese Optics Letters 2024年第1期22卷 128-134页

作者：张佳琦闫玉岳刘立媛张伟力 Centre for Terahertz Waves and College of Precision Instrument and Optoeletronics Engineering Tianjin UniversityTianjin 300072China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078United States

The dynamics of water within a nanopool of a reverse micelle is heavily affected by the amphiphilic *** this work,the terahertz(THz)spectra of cyclohexane/Igepal/water nonionic reverse micelle mixture are measured by THz timedomain spectroscopy and analyzed with two Debye models and complex permittivity of background with volume *** on the fitted parameters of bulk and fast water,the molar concentration of all kinds of water molecules and hydration water molecule number per Igepal molecule are *** find that slow hydration water has the highest proportion in water when the radius parameterω_(0)water becomes the main component whenω_(0)≥*** feature radius ratio of nonhydrated and hydrated water to total water nanopool is roughly obtained from 0.39 to 0.85 with increasingω_(0).

关键词： reverse micelle water dynamics THz spectroscopy

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