烟台棕壤土饱和导水率的初步研究

Preliminary study on the saturated hydraulic conductivity of brown forest soil in Yantai

该文利用单环入渗的概化解,对不同土地利用方式下烟台棕壤土的饱和导水率进行了研究,同时分析了不同单环直径对求解饱和导水率产生的影响。研究结果表明:草地、裸地和道路的入渗速率、累积入渗量和饱和导水率呈现依次降低的变化趋势,利用直径为20、30和45 cm的入渗环得到的饱和导水率具有明显的差异性。根据求解的饱和导水率计算的累积入渗量非常接近实测值,整体相对误差很小,草地、裸地和道路,在5、7和40 m in后浮动在5%以内;在15、43和55 m in后变化幅度小于1%。20、30和45 cm入渗环累积入渗量计算值的相对误差初始阶段波动较大,随后逐渐趋于平稳。

Based on single-ring infiltration and generalized solution, the saturated hydraulic conductivities of brown soil under different land use patterns were studied, and the effects of different diameter rings on saturated hydraulic conductivity were also explored. The results show that infiltration rates, accumulative infiltration and saturated hydraulic conductivities, which were measured separately in sward, bare soil and road, decreases in turn. The calculated saturated hydraulic conductivities with 20 era, 30 cm and 45 cm rings has obviously difference. The accumulative infiltration calculated with saturated hydraulic conductivities is very close to measured one, and the relative error as a whole is very low. At the beginning, the relative error was very high, then it decreased gradually. The relative error of calculated accumulative infiltration of sward, bare soil and road is less than 5% after 5 rain, 7 rain and 40 rain, and it is less than 1% after 15 rain, 43 rain and 55 rain. Furthermore, The relative error of calculated accumulative infiltration, of which 20 cm, 30 cm and 45 cm rings fluctuates obviously in the beginning, then keeps to steady.