کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4576186 1629945 2013 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Usability of calcium carbide gas pressure method in hydrological sciences
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Usability of calcium carbide gas pressure method in hydrological sciences
چکیده انگلیسی


• CCGP can be used as a rapid ground truthing method for soil moisture measurements.
• Expected accuracy of the CCGP method is mostly within ±1%.
• CCGP can be used as stand alone method for small scale hydrological applications.

SummarySoil moisture is a key engineering variable with major influence on ecological and hydrological processes as well as in climate, weather, agricultural, civil and geotechnical applications. Methods for quantification of the soil moisture are classified into three main groups: (i) measurement with remote sensing, (ii) estimation via (soil water balance) simulation models, and (iii) measurement in the field (ground based). Remote sensing and simulation modeling require rapid ground truthing with one of the ground based methods.Calcium carbide gas pressure (CCGP) method is a rapid measurement procedure for obtaining soil moisture and relies on the chemical reaction of the calcium carbide reagent with the water in soil pores. However, the method is overlooked in hydrological science applications. Therefore, the purpose of this study is to evaluate the usability of the CCGP method in comparison with standard oven-drying and dielectric methods in terms of accuracy, time efficiency, operational ease, cost effectiveness and safety for quantification of the soil moisture over a wide range of soil types. The research involved over 250 tests that were carried out on 15 different soil types. It was found that the accuracy of the method is mostly within ±1% of soil moisture deviation range in comparison to oven-drying, and that CCGP method has significant advantages over dielectric methods in terms of accuracy, cost, operational ease and time efficiency for the purpose of ground truthing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 503, 30 October 2013, Pages 67–76
نویسندگان
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