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دانلود رایکان مقاله انگلیسی ISI با موضوع محاسبه شارهای رسوب رودخانه از اندازه گیری های غیر مطمئن و نادر

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محاسبه شارهای رسوب رودخانه از اندازه گیری های غیر مطمئن و نادر

عنوان انگلیسی مقاله:

Calculation of river sediment fluxes from uncertain and infrequent measurements

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4. Conclusion

This paper tackled feasibility and precision issues in calculation of fluxes of suspended particulate matter (SPM) by assuming systematic errors in the water discharge (Q) and random errors in sediment concentration (C) data and under the additional constraint of infrequent sediment concentration samplings. The chosen framework compared the merits and drawbacks of the classical rating curve (C = aQb ) with those of an improved rating curve approach (IRCA, C = aQb + a1dS) in which the correction term is an indicator of the variations in sediment storage and is thus related to flow dynamics. Successive steps of the analysis were: (1) to establish the effects of data uncertainty on the fitted coefficients (a, b, a1) and on the calculated SPM fluxes, (2) to examine how infrequent sediment concentration data affects these estimates and (3) to combine both effects into the definition of realistic cases, thus allowing an application to sediment exports from French rivers.