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基于GIS对新安江模型的改进初探 总被引:2,自引:0,他引:2
新安江模型能较好解决降雨时空分布问题,但忽略了其他分布不均的影响。流域汇流特征在很大程度上取决于流域形状特征和地形分布。提出一种方法,利用数字高程模型(DEM)划分子流域,提取各单元流域的平均坡度和最大汇流路径长度,以最大汇流路径长度推求形状系数,并将形状系数和平均坡度引入模型结构中,建立其与汇流参数之间的相关关系,使新安江模型能同时考虑降雨、流域形状以及地形分布。将改进后的模型应用于沿渡河流域进行验证,效果良好。 相似文献
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本文以合肥市地埋管地源热泵适宜性分区为例,采用层次分析法和综合指数法相结合的方法进行评价。评价结果表明,合肥大部分地区都适宜于应用地埋管地源热泵系统,除少数基岩裸露区外,其余都为适宜区和较适宜区,其中适宜区面积为597km~2,较适宜区面积为141km~2。评价结果与客观情况基本吻合,分区结果合理可靠。 相似文献
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实践表明,在地形地质复杂地段,做好工程地质选线是保证工程勘察设计质量的关键。本文以××国道选线为例总结了有关的经验和体会。 相似文献
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The fuel properties of coastal plant Xanthium sibiricum were investigated in thermogravimetrics.The distributed activation energy model was employed in the kinetic analysis and a simplified mathematical model that can predict the thermogravimetry curves was proposed.The results show that the initial decomposition temperature tends to increase with the heating rate.The distributed E values ranged from 169.08 to 177.43 kJ/mol,and the frequency factor values ranged from 6.59× 10~8 to 1.22×10~(12)/s at different conversion rates.Furthermore,the prediction made with the simplified mathematical model perfectly matched the experimental data,and the model was found to be simple and accurate for the prediction of devolatilization curves. 相似文献
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The industrially important organic compound 1,3-propanediol(1,3-PDO) is mainly used as a building block for the production of various polymers. In the present study, response surface methodology protocol was followed to determine and optimize fermentation conditions for the maximum production of 1,3-PDO using marine-derived Klebsiella pneumoniae HSL4. Four nutritional supplements together with three independent culture conditions were optimized as follows: 29.3 g/L glycerol, 8.0 g/L K 2 HPO 4, 7.6 g/L(NH 4) 2 SO 4, 3.0 g/L KH 2 PO 4, pH 7.1, cultivation at 35°C for 12 h. Under the optimal conditions, a maximum 1,3-PDO concentration of 14.5 g/L, a productivity of 1.21 g/(L·h) and a conversion of glycerol of 0.49 g/g were obtained. In comparison with the control conditions, fermentation under the optimized conditions achieved an increase of 38.8% in 1,3-PDO concentration, 39.0% in productivity and 25.7% in glycerol conversion in flask. This enhancement trend was further confirmed when the fermentation was conducted in a 5-L fermentor. The optimized fermentation conditions could be an important basis for developing lowcost, large-scale methods for industrial production of 1,3-PDO in the future. 相似文献
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科技的发展带动技术的进步,针对水文行业的新设备应运而生。雷达波流速仪具有不接触水体、全天候工作、高度智能化的特点,是应对中高洪水流量测验安全、有效的一种测验设备。但是电波流速仪测量的只是水面流速,如何应用这种仪器来达到测流目的,使其测量结果满足水文规范的要求,还需要经过分析实验。利用两年时间对巴林桥断面水面流速系数进行比对分析,着重考虑了风的影响,确定得出不同量级洪水在不同风速下的水面流速系数。根据合理、准确的测验方式及利用该系数计算成果的两种方法的一致性,将取得的成果资料在今后测验中全面投入使用。 相似文献
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