基于SWAT模型的三峽庫(kù)區(qū)大寧河流域產(chǎn)流產(chǎn)沙模擬及土壤侵蝕研究
[Abstract]:In order to study the status and characteristics of soil erosion in the Daning River basin of the three Gorges Reservoir area, SWAT model was used to simulate the runoff and sediment yield in the Daning River basin. The sensitivity of the model was analyzed and corrected based on the SUFI-2 method in the SWATCUP tool. Validation and uncertainty analysis (a correction period from 2008 to 2010 and a validation period from 2011 to 2013), and an analysis of the effects of different land use, soil types and slope levels on soil erosion in watersheds, The prevention and control measures of soil loss exceeding the standard were put forward. The results show that: (1) the corrected SWAT model is 0.89 and 0.75 and 0.69 r-factor in the simulation of Danning River basin runoff, respectively, and 0.87 and 0.91 in the sand production simulation, respectively, and 0.75 and 0.69 r-factor in the correction period and the verification period, respectively, and 0.87 and 0.91 respectively in the sand production simulation, and the results show that: (1) the corrected SWAT model is 0.87 and 0.91 respectively in the simulation of runoff production in the Daning River Basin. The p-factor values of correction period and verification period were 0.90 and 0.95 r-factor, respectively, 1.04 and 1.05 r-factor, 0.77 and 0.75 of NS, 0.74 and 0.72, respectively. The SWAT model is suitable for the simulation of runoff and sediment yield and soil erosion in Daning River Basin, and the uncertainty meets the requirements. (2) the average erosion modulus of the whole Daning River basin from 2008 to 2013 is 468.88t/ (the total soil erosion intensity of km~2 a), belongs to micro-degree). However, the soil erosion intensity in the local sub-watershed (1 ~ 2 ~ 2 ~ 3 ~ 3 ~ 3 ~ 4 ~ 4 ~ (-22) was mild. The soil loss tolerance 500t/ (km~2 a),) is more than 37.44% of the whole watershed. (3) the factors that lead to soil loss exceeding the standard in the mild soil erosion area include the cultivated land and grassland in the land use type. The dark leached soil and saturated clay rock soil in soil types, as well as farmland and grassland with a slope of 25 擄, may be the most important cause of soil loss exceeding the standard in mildly eroded areas, among which the excess area of saturated clay rock soil may be the most important cause. It is suggested that in the area of mild soil erosion, a certain proportion of cultivated land and grassland with a slope of 25 擄should be returned to forest and grassland.
【作者單位】: 中國(guó)科學(xué)院生態(tài)環(huán)境研究中心環(huán)境水質(zhì)學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;中丹科教中心;中國(guó)科學(xué)院大學(xué);
【基金】:國(guó)家自然科學(xué)基金項(xiàng)目(21277169,51290283,21477158)
【分類號(hào)】:S157.1
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