The middle route project of s - n water transfer is a long route one , crosses 4 basins of the yangtze river , the haihe river , the yellow river , the haihe river , and the engineering geologic conditions differ greatly 摘要南水北调中线工程线路长，跨越长江、淮河、黄河、海河4大流域，工程地质条件差异较大。
Lastly , the scaling hypotheses is applied to the relationship of flood volume and duration in this paper . the flood intensity - duration - frequency form is proved based on the temporal scaling property of flood 最后，本文将标度不变性引入洪水洪量? ?历时关系中，对大流域年最大洪量随历时变化的标度性质行了尝试性的研究。
In 2004 , with the support of danone - evian group , the wetland ambassadors have expanded their geographic range beyond china ' s borders , and carried out activities along both the yangtze and mekong rivers in china , myanmar , cambodia , laos and vietnam 2004年在达能?依云集团的资助下，湿地使者行动把活动范围扩展到长江与湄公河两大流域，涉及中、柬、缅、越、老、泰等六个国家，使湿地使者行动第一次走出了国门。
Comprehensive harness of small watershed has made the combination of large with small watersheds , county with township , village and households , and point with wide ranges , it also realize the unification of harness and development , ecological benefit and economical benefit , as well as harness and prevention 小流域综合治理实现了大流域与小流域、县与乡村户、点与面的结合，实现了治理与开发、生态效益与经济效益的统一，体现了防与治的统一。
At present , our country has already made some basin correlated with managing in the basin and legislated , have established the differentiated control in the changjiang river , the yellow river , huaihe river , haihe river , pearl river , loose liaohe river , seven major basin of tai hu , have played certain function on the water resource protecting the basin 目前,我国已经制定了一些与流域管理相关的流域立法,确立了长江、黄河、淮河、海河、珠江、松辽河、太湖七大流域的分级管理,对保护流域的水资源起到了一定作用。
The capsim model , originally developed by the center for chinese agricultural policy research of the chinese academy of sciences , is the first and most comprehensive model for chinese food demand , supply and trade analysis at the national level . the podium model , developed by the international water management institute , is a tool for accounting of water resources at the basin level . capsdvi - podium has been used as a tool in this paper for analyzing food security and water balance scenarios of china in 2020 based upon the database about food and water situation at the national level , provincial level , basin level and county level , hi accordance with such analysis , this paper puts forward policy recommendations for irrigation diversion of water , regional distribution of agriculture and food security 因此，论文将粮食需求和生产、灌溉需水和水资源保障紧密的联系起来，在不打破水资源流域特性的基础上，以全国和九大流域片为研究对象，通过利用全国、流域、省级、县级统计资料和农产调查及专家访谈资料所建立的包含农业生产、粮食供求、灌溉用水和水资源等指标体系在内的中国粮食安全与水资源数据库，以原来中国科学院农业政策研究中心( ccap )开发的以部门均衡理论为基础的农业政策分析和预测模型( capsim )和国际水资源管理研究所( iwmi )开发的以流域水资源核算理论为基础的水资源政策分析模型( podium )为依托，发展了capsim ? podium模型，利用该模型为工具，系统、全面地分析了未来全国和九大流域片的灌溉水平衡和粮食安全情景，在此基础上提出我国灌溉用水、区域农业布局和粮食安全政策。
Developing and establishing macro - scale distributed hydrological model are required in order to make certain the regional water and energy cycle , study and resolve the hydrology and water resources problems under the changing environment according to the climatic prediction of gcm . as a branch of hydrologic cycle , land - surface hydrologic processes are nearly relative to atmospheric circle by water and energy exchange between land - surface and atmosphere 为了确定大尺度区域水文循环及能量收支、能够根据gcm给出的气候预测，研究和解决变化环境中的水文水资源问题，评估和监测大流域的径流过程和水资源量的动态变化规律，需要研制和建立大尺度分布式水文模型。
The south - to ~ north water transfer project is a large - size trans - basin strategic water infrastructure aiming for improvement of natural environment , supporting sustainable water development and a project related to sustainable development of economy and society , eco - environment protection and survival of offspring in the 21st century or even longer 南水北调工程是一项跨大流域的大规模调水工程，一项改造自然环境、支撑我国可持续发展的重大基础性、战略性工程，是关系到21世纪乃至更长时期我国经济社会可持续发展、生态环境保护和子孙后代生存的长远利益的工程。
