莱洲湾沿岸浅层地下卤水蒸发成因新依据     

李伟  吴衍华 《山东国土资源》2007,(Z1)

山东莱洲湾沿岸是我国重要的天然卤水矿产地,分布广、浓度高、储量大,关于其成因通过近几十年来的研究可归纳为蒸发浓缩生卤和冰冻生卤2种,但其依据尚不够丰富。该文从海水冰冻实验与蒸发实验所经历的路径中,Na/Cl与Ca/Mg随浓缩倍数的变化趋势来分析卤水的成因,认为其应属蒸发浓缩生卤。  相似文献   

Simulations of water resource environmental changes in China during the last 20 000 years by a regional climate model     

Y.Q. Zheng  Z.C. Qian  H.R. He  H.P. Liu  X.M. Zeng  G. Yu 《Global and Planetary Change》2007,55(4):284-300

We utilize a regional climate model with detailed land surface processes (RegCM2) to simulate East Asian monsoon climates at 0 ka, 6 ka and 21 ka BP, and evaluate the changes in hydrology process, including vapor transportation, precipitation, evapotranspiration and runoff in the eastern and western China during these periods. Results indicate that the Tibetan Plateau climate presents a wet–cold status during the LGM while it exhibits a wet–warm climate at 6 ka BP. The LGM wetter climate over the Tibetan Plateau mainly results from the increased vapor inflow through its south boundary, while the increase in the vapor import over the Tibetan Plateau at 6 ka BP mostly sources from its west boundary. The increase in the LGM runoff over the Tibetan Plateau is mainly caused by the decrease in evapotranspiration, while the increase in runoff at the 6 ka BP mainly by the enhanced precipitation. Eastern China (including southern China) presents a dry status during the LGM, which precipitation and runoff decreases significantly due largely to weakened Asian summer monsoon that results in the decreased vapor inflow through the south boundary of eastern China. The variation pattern in the hydrological cycle in eastern China is contrary to that in western China during the LGM. The increase in precipitation and runoff at 6 ka BP in eastern China is tightly related to the strong Asian summer monsoon that leads to increased vapor import through the south boundary. Long term decrease trend in precipitation and runoff in northern China since the last 20 000 years may be attributed to the steady increase in vapor export through the east boundary as a result of the changes of East Asian monsoon and the adjustments of local atmospheric circulations in this area.  相似文献   

岩溶单元流域结构与水资源开发利用模式研究—— 以贵州省普定后寨岩溶流域为例   总被引：4，自引：0，他引：4  

陈洪元  胡兴华  杨勇  陈邦宇 《中国岩溶》2001,20(1):21-26

在论述后寨岩溶单元流域二元流场结构的基础上，对地表、地下水资源进行了估算，根据水资源量和上、中、下游不同地貌组合类型，采取上游蓄、排，中游蓄、引、提，下游引、提的综合开发利用模式，解决了流域81km2的工、农业用水和普定县城3万余人的饮用水问题。  相似文献   

基于XML的地质信息共享与交换模型   总被引：1，自引：0，他引：1  

刘俊山青  陆现彩  徐士进  董少春  金莹 《物探化探计算技术》2001,23(2):160-165

作者简单介绍了了地质信息资源网络化的意义和发展状况，最近几年地质信息的网络化取得了飞跃的发展，在信息共享和交换方面取得了一定进展，但也暴露出许多不足，作者提出了在信息使用中数据源和客户端使用者之间建立了基于XML－Externsible Markup Language的地质信息共享与交换网络服务层的思路，对网络服务层的概念和优点进行阐述，并通过程序代码和简单注释说明使用XML技术的实现方案和方法。  相似文献   

Water scarcity problems in Israel     

Amnon Kartin 《GeoJournal》2001,53(3):273-282

The demand for scarce fresh water requires Israel to cease squandering this limited resource on agriculture, at present consuming about 70% of the annual supply. Environmental pollution must cease as well, for untreated urban water effluent contaminates ground water. All Israel's 700 million cubic metres sewage water must be suitably purified to irrigate about one hundred thousand hectares. Climatically controlled greenhouses and advanced agricultural research will reduce the amount of water and land required for the cultivation of the fresh vegetables and fruit, and small proportion of the dry fodder needed for the country's consumption. Israeli agriculture's association with moral, ideological and social ideas obstructs meaningful reduction in the allocation of water to agriculture. The Zionist movement has always seen transforming land into a means of production as the index of its success. Failure in this would signify an inability to adapt to adverse environmental conditions and be a sweeping repudiation of Zionism. The protracted Israeli-Arab national conflict also affects water policy. Israeli Jewish society has always considered rural settlement, agricultural activity, as part of the substance of its national identity and power, bonding the people with the land and consolidating territorial sovereignty. Since the 1970s, capitalism, which has dominated Israeli ideology, has favoured the individual's interests over the community's. Thus agriculture is mobilized to accommodate the private struggle for the good of the farming sector against the needs of the national collective.  相似文献   

RS、GIS支持下的龙口市地下水开发利用规划   总被引：4，自引：0，他引：4  

吴泉源  侯伟  安国强 《国土资源遥感》2001,12(3):41-46

遥感(RS)与地理信息系统(GIS)作为两大高新技术,可以独立地、也可以相互补充地为地下水资源开发利用提供技术支持。通过对地下水资源规划信息系统的构建与分析,能快速准确地获取地下水资源的时空分布信息。本文介绍了RS与GIS用于地下水资源规划中的技术方法及应用效果.  相似文献   

江西红色泥岩加热变化规律研究   总被引：3，自引：0，他引：3  

王平  周萍华  彭人勇  赵尊信  马燕明  李顺如  漆小鹏 《矿物学报》2001,21(3):505-507

本文对江西红色泥岩进行了系统的加热变化规律研究，阐述了其化学成分和矿物成分在陶瓷过程中的作用与特性，以及铁物质的演化过程，得到了红色泥岩在不同温度下的变化规律。  相似文献   

李雅普诺夫不稳定性与暴雨发生的关系          下载免费PDF全文

林杏奇  冯光柳 《应用气象学报》1995,6(3):304-310

用李雅普诺夫稳定性理论第二方法的概念，找出一个与大气扰动微分方程组有关的李雅普诺夫函数δ￣２Ｓ，用δ￣２Ｓ与其导数乘积的符号确定系统的稳定性，诊断暴雨落区和强度。在１９９３年６～８月暴雨预报试验中，三峡地区发生８次暴雨过程，报出５次。  相似文献   

甘肃省畜牧气候资源分析   总被引：2，自引：0，他引：2  

葛秉钧 《干旱气象》1995,(1)

从甘肃省畜牧气候资源基本特点出发，着重分析了畜牧业界限温度指标、时空分布以及气候条件对牧草产量、家畜膘情变化、牧事活动的影响。  相似文献   

干旱区土壤资源研究综述   总被引：1，自引：1，他引：1  

王铁成 《干旱区地理》1995,(3)

本文综述了干旱区土壤资源在全球的分布和特征，回顾了土壤分类的研究历史和现状，展望了干旱土纲的发生和分类研究进展和趋势；评述了在土壤分类研究基础上发展起来的土壤资源评价方法和现状，指出了未来干旱区土壤资源评价研究趋势．  相似文献