低风速下蒸发池年均大气弥散不同计算方法的比较  

Comparison of Different Estimation Methods of Annual Average Atmospheric Dispersion of Evaporating Pond under Low Wind Speed Condition

作　　者：朱好 郑平辉 王晓亮 郑伟 白晓平 

机构地区：[1]中国核电工程有限公司,北京100840

出　　处：《安徽农业科学》2015年第13期309-312,共4页Journal of Anhui Agricultural Sciences

摘　　要：分别采用虚源法和三维拉格朗日高斯烟团模式CALPUFF结合数值积分算法,计算了我国某一低风速频率较高的内陆厂址虚拟蒸发池的年均大气弥散因子,对虚源法在低风速厂址的适宜性进行了探讨。研究表明,虚源法由于不考虑小静风条件下污染物的近区累积和多方位弥散,因而在低风速频率较高的厂址,对10 km以内方位最大弥散因子和各扇区年均弥散因子的计算结果存在不保守的情形。对于复杂下垫面,虚源法预测的年均最大弥散因子出现位置与实际情况有所偏离。建议对于低风速频率较高、下垫面复杂的厂址,在评价蒸发池等类似面源的环境影响时,选择其他适宜的大气扩散模式和方法。The annual average atmospheric dispersion factors （ADFs） of a hypothetical evaporating pond in an inland site which is character- ized by high low wind speed frequency are calculated by using virtual point source method （VPSM） and a three dimensional Lagrangian Gauss- ian puff model CALPUFF together with the numerical integration algorithm, respectively. Adequacy of VPSM at the site of low wind speed con- dition is discussed. The results show that estimations of directional maximum ADFs in the radius of 10 km and sectorised annual average ADFs at the site of high low wind speed frequency predicted by VPSM may not be conservative, since the near-field accumulation of the pollutants and multi-directional dispersion under calm and light wind conditions are not considered by VPSM. For complex underlyi^ag surfaces, the loca- tions of the maximum annual average ADFs predicted by VPSM can deviate from the real situation. Thus, other suitable atmospheric dispersion models and methods are suggested to be used in the environmental impact assessment of evaporating ponds and other similar area sources for the site of high low wind speed frequency and complex underlying surfaces.

关 键 词：年均大气弥散因子 面源 虚源法 CALPUFF 低风速 

分 类 号：S181.3[农业科学—农业基础科学] X169[环境科学与工程—环境科学]