بررسی روند تغییرات مکانی غلظت رسوب در طول دامنه

گلکاریان, علی; احمدی, حسن; سلاجقه, علی; جعفری, محمد; شهبازی, علی

doi:10.22059/jrwm.2015.53476

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ استادیار دانشکدة منابع طبیعی و محیط زیست دانشگاه فردوسی مشهد

² هیات علمی بازنشسته دانشگاه تهران

³ عضو هیات علمی دانشکده منابع طبیهی دانشگاه تهران

⁴ عضو هیات علمی دانشکده منابع طبیعی دانشگاه تهران

⁵ دانشجوی دکتری آبخیزداری دانشگاه تهران

https://doi.org/10.22059/jrwm.2015.53476

چکیده

فرسایش یکی از مهم‌ترین عوامل تخریب خاک و کاهش حاصل‌خیزی است. از آنجایی که طول دامنه یکی از فاکتورهای مؤثر در شکل زمین و، درنتیجه، در میزان فرسایش است، در این تحقیق سعی شد تغییرات مکانی غلظت رسوب در طول دامنه تا رسیدن به ظرفیت حمل بررسی شود. بدین منظور، یک سیستم شبیه‌ساز دامنه طراحی و ساخته شد. این سیستم شامل ده فلوم پنج‌متری است که با سری‌کردن آن‌ها دامنه‌ای پنجاه‌متری ایجاد می‌شود. در این سیستم، به کمک پنجاه لولة آبده، که به فواصل یک‌متری بر روی فلوم‌ها نصب شده و آبدهی هر یک 100 میلی‌لیتر است، جریان تجمعی ایجاد می‌شود. متغیرهای دیگر شامل دو نوع خاک است: یکی با بستر مارنی و دیگری با بستر کنگلومرایی از منطقة طالقان، و شیب در سه سطح 15، 5_/22، و 30 درصد است. برای هر تیمار سه تکرار و در مجموع 18 بار آزمایش انجام گرفت. در هر آزمایش، از انتهای هر فلوم چهار نمونه گرفته شد و غلظت آن تعیین گردید. سپس، داده‌ها به صورت فاکتوریل و در قالب طرح‌های کاملاً تصادفی تجزیه و تحلیل آماری شد. همچنین، برای برازش یک منحنی مناسب بر داده‌های مشاهده‌ای از تابع ریچارد استفاده شد. نتایج نشان‌دهندة معنی‌دارنبودن خاک‌ها و معنی‌دارشدن شیب و طول دامنه در غلظت رسوب است. از طرف دیگر، قرارگرفتن غلظت رسوب دو فلوم آخر در یک کلاس نمایانگر نزدیک‌شدن غلظت رسوب به ظرفیت حمل در این طول است. همچنین، از نتایج به‌دست‌آمده این‌گونه استنباط می‌شود که مدل ریچارد به‌خوبی می‌تواند روند تغییرات غلظت در طول دامنه را شبیه‌سازی نماید.

کلیدواژه‌ها

عنوان مقاله [English]

Effect of slope length on spatially variation of concentration

نویسنده [English]

Ali Golkarian ¹

چکیده [English]

Erosion is one of the important factors in soil degradation and decrease fertility and slope length is one of the most effective factors in land form and amount of erosion. The objective of this study was investigation of spatially variation of sediment concentration in slope length until to receive transport capacity. To obtain this goal a hill slope simulator system designed and manufactured. This system include 10 flumes, each has five meter length which after series them become fifty meters. This system can produce cumulative flow via fifty watering can tube which are install on flumes with one meter interval and each flume discharging is 100 cc. Other variables include two type of soil and slope in three level 15, 22.5, 30 percent. Three replications were used for each treatment and totally 18 experiment was done. In each experiment four samples were gathered from end of each flume and concentration was determined. Complete randomized design with factorial arrangement was used for data analyzing. Richard’s function was used for fitting a suitable curve on observed data. Result was shown that effect of soil type on sediment concentration was not significant while slope and slope length effects was significant. Otherwise sediment concentration in the two last flumes was located in same class which is shown that sediment concentration achieved to transport capacity in this slope length. Also results were shown that Richard’s function can simulate trend of concentration variety in slope length.

کلیدواژه‌ها [English]

erosion
Sediment concentration
Slope length
Transport capacity

مراجع

[1] Aksoy, H.L. and Kavvas, M. (2005). A review of hillslope and watershed scale erosion and sediment transport models, Catena, 64, 247-271.

[2] Alonso, C.V., Neibling, W.H. and Foster, G.R. (1981). Estimating sediment capacity in watershed modeling, Trans. ASAE, 24, 1211-1220, 1226.

[3] Bennett, S.J. (1999). Effect of Slope on the growth and migration of headcuts in rill, Geomorphology, 30, 273-290.

[4] Bradford, J.M. and Foster, G.R. (1996). Interrill soil erosion and slope steepness factors. Soil Sci. Soc. Am. J., 60, 909-915.

[5] Elliot, W.J., Laflen, J.M. and Foster, G.R. (1993). Soil erodibility nomographs for the WEPP model, paper No 932046, presented at the 1993 Int. summer Meeting of ASAE and CSAE, Spokane, Washington.

[6] Flanagan, D.C. and Nearing, M.A . (ed.) (1995). USDA-Water Erosion Prediction Project: Hillslope Profile and Watershed Model Documentation, NSERL Report No. 10. West Lafayette, Ind.: USDA-ARS Nat. Soil Erosion Research Lab.

[7] Flanagan, D.C. and Nearing, M.A. (ed.) (1995). USDA-Water Erosion Prediction Project: Hillslope Profile and Watershed Model Documentation, NSERL Report No. 10. West Lafayette, Ind.: USDA-ARS Nat. Soil Erosion Research Lab.

[8] Govers, G. (1990). Empirical relationship for the transporting capacity of overland flow. In: Walling, D.E., Yair, A., Berckowicz, C. (Eds.), Erosion, Transport, and Deposition Processes, Proceedings of the erusalem Workshop, vol. 189. IAHS Pub., Wallingford, UK, pp. 45-64.

[9] Harisin, P.B. and Rose, C.W. (1991). Rainfall detachment and deposition: sediment transport in the absence of flow-driven processes, Soil Sci. Soc. Am. J., 55, 320-324.

[10] Harisine, P.B. and Rose, C.W. (1992). Modeling water erosion due to overland flow using physical principles, 2. Rill Flow. Water Reso. Res., 28(1): 245-250.

[11] Hogarth, W.L., Parlange, J.Y., Rose, C.W., Sander, G.C., Steenhuis, T.S. and Barry, A. (2004). Soil erosion due to rainfall impact with inflow: An Analytical solution with spatial and temporal effects, J. Hydro., 295, 140-148.

[12] Huang, C., Wells, L.K. and Norton, L. D. (1999). Sediment transport capacity and erosion processes: Model concepts and reality, Earth Surf. Process. Landforms, 24, 503-516.

[13] Huang, C.-H., Bradford, J.M. and Laflen, J.M. (1996). Evaluation of the detachment-transport coupling concept in the WEPP rill erosion equation, Soil Sci. Soc. Am. J., 60, 734-739.

[14] Lei, T.W., Nearing, M.A., Haghighi, K. and Bralts, V.F. (1998). Rill erosion and morphological evolution: A simulation model, Water Reso. Res., 34, 3157-3168.

[15] Lei, T.W., Zhang, Q.W., Zhao, J. and Nearing, M.A. (2006). Tracing sediment dynamics and sources in eroding rills with rare earth elements, European J. Soil Sci., 57, 287-294.

[16] Lei, T.W., Zhang, Q.W., Zhao, J., Xia, W.S. and Pan, Y.H. (2002). Soil detachment rates for sediment loaded flow in rills, Transactions the ASAE, 45, 1897-1903.

[17] Mahmoodabadi, M., Rejahi, H.D. and Rouhipour, H. (2007). Study on interrill and rill erosion and related processes using rainfall and runoff simulation. Ph.D. Thesis, Tehran University, 256 p.

[18] Marques, M.J., Bienes, R., Jimenez, L. and Perez-Rodriguez, R. (2007). Effect of Vegetal Cover on Runoff and Soil Erosion under Light Intensity Events, Rainfall Simulation over USLE Plots, Science of the Total Environment, 378, 161-165.

[19] Merten, G.H. and Nearing, M.A. (2001). Effect of sediment load on soil detachment and deposition in rills, Soil Sci.Soc. Am. J., 65, 861-868.

[20] Misra, R.K. and Rose, C.W. (1996). Application and sensitivity analysis of process-based erosion model GUEST, Eur. J. Soil Sci, 47, 593-604.

[21] Nearing, M.A., Bradford, J.M. and Parker, SC. (1991). Soil detachment by shallow flow at low slopes, Soil Sci. Soc. Am. J., 55, 339-344.

[22] Nearing, M.A., Foster, G.R. Lane L.J. and Finkner, S.C. (1989). A process-based soil erosion model for USDA-water erosion prediction project technology, Trans. ASAE, 32,1587-1593.

[23] Nearing, M.A., Norton, L.D., Bulgakov, D.A., Larionov, G.A., West, L.T. and Dontsova, K.M. (1997). Hydraulics and erosion in eroding rills, Water Resour. Res, 33(4): 865-876.

[24] Polyakov, V.O. and Nearing. M.A. (2003). Sediment transport in rill flow under deposition and detachment conditions, USDA-ARS National Soil Erosion Research Laboratory, West Lafayette, IN 47907-1196, USA.

[25] Rejman, J., Turski, R. and Paaluszek, J. (1998). Spatial and Temporal Variation in Erodibility of Loss Soil, Soil and Tillage Research, 46, 61-68.

[26] Sadeghi, H.R., Bashari, M. and Rangavar, A.S. (2008). Comparing the sediment variation with hillside direction and plot length in storm wise soil erosion, Soil & water 22, number 2.

[27] Shainberg, I., Goldstein, D. and Levy, G.J. (1996). Rill erosion dependence on soil water content aging and temperature. Soil Sci. Soc. Am. J., 60, 916-922.

[28] Tayfur, G. (2002). Applicability of sediment transport capacity models for non-steady state erosion from steep slopes. ASCE. J. Hydro. Eng., 7(3): 252-259.

[29] Toy, T.J., Foster, G.R. and Reynard, K.G. (2002). Soil Erosion Processes, Prediction, Measurement and Control, John Wiley and Sons, New York, 338p.

[30] Zachar, D. (1984). Soil Erosion, Problems and Methods of Soil Erosion Research, VEDA, Brtislava, 547p.

[31] Zhang, G.H., Liu, B.Y., Nearing, M.A., Huang, C.H. and Zhang, K.L. (2002). Soil detachment by shallow flow, Trans. ASAE., 45, 351-357.

[32] Zhang, X.C., Li, Z.B. and Ding, W.F. (2005). Validation of WEPP sediment feedback relationships using spatially distributed rill erosion data, Soil Science Society of America Journal, 69, 1440-1447.

[33] Zhang, X.C., Tingwu, Lei and Jun, Zhao (2008). Estimation of the detachment rate in eroding rills in flume experiments using an REE tracing method, Geoderma, 147, 8-15

[34] Zheng, F.L., Huang, C.H. and Norton, L.D. (2000). Vertical hydraulic gradient and run-on water and sediment effects on erosion processes and sediment regimes, Soil Sci. Soc. Am. J., 64, 4-11.

نشریه علمی - پژوهشی مرتع و آبخیزداری

بررسی روند تغییرات مکانی غلظت رسوب در طول دامنه

مراجع

مراجع

دوره 67، شماره 4 - شماره پیاپی 4
بهمن 1393
صفحه 587-601

بررسی روند تغییرات مکانی غلظت رسوب در طول دامنه

مراجع

مراجع

دوره 67، شماره 4 - شماره پیاپی 4بهمن 1393صفحه 587-601

دوره 67، شماره 4 - شماره پیاپی 4
بهمن 1393
صفحه 587-601