Based on the technology of simulation cloning , ppisc ( parallel and progressive incremental simulation cloning ) approach was proposed to concurrently analyze alternative scenarios of the numerical simulation of unsteady flow in river networks for flood mitigation operation , which was used to optimize the simulation execution by avoiding unnecessary repeated computation among independent scenarios 摘要针对河网非恒定流设定情景批量仿真中存在大量的重复计算，提出了一种基于仿真克隆技术的并行累进增量克隆仿真方法。
After that , various alternative scenarios are formulated on consumption expenditure , price of feedstuff , production technology , transportation cost , tariffs and etc , and simulated by gams . the comparison between base scenario and modeling results of various alternative scenarios shows that various policy variables have an effect on the meat supply , demand and trade flows among regions , which influences the national meat market in china 接着，基于从供给、需求和流通三个方面考虑对中国肉产品市场空间均衡格局的影响，并根据居民肉产品消费支出、饲料价格、生产技术、运输费用、关税和世界其同国家肉产品产量和需求量等相关变量的变化设立各种政策方案，并进行模拟。
