Local Modeling模型及其在黄河上游月径流预测中的应用   总被引：2，自引：0，他引：2  

蓝永超  王书功  丁永建  马建华  赵昌瑞  曹春晖 《冰川冻土》2004,26(3):344-348

基于黄河上游有关水文气象台站的降水径流资料, 将Local Modeling方法应用于龙羊峡水库月入库径流预报的中长期水文预报模型. 模型的检验和应用结果表明, 该方法有着稳健性好、数学物理意义明确、对数据系列要求不高和容易操作等优点, 在非汛期各月的径流预测中具有较高的准确性, 并且在考虑了降水的影响后, 对汛期径流的计算精度亦基本符合水文情报预报规范和实际应用的要求. 该模型在黄河上游水量预报和调度工作中具有良好的应用前景.  相似文献   

污染场地健康风险评价述评     

孙金华  马建华 《气象与环境科学》2011,34(4):72-78

首先介绍了污染场地（场地是一定范围内的土壤、地下水、地表水、大气和生物的总和）健康风险评价产生的背景;然后从风险评价理论与方法、重金属与有机物污染及健康风险评价实例、污染场地环境管理等方面综述了国内外研究现状;最后系统分析了目前我国污染场地健康风险评价中存在的5大问题,并对其未来的发展趋势进行了展望。  相似文献   

Toxicity of ammonia to surf clam (Spisula solidissima) larvae in saltwater and sediment elutriates     

Ferretti JA  Calesso DF 《Marine environmental research》2011,71(3):189-194

Ammonia is a natural component of sediments and has been identified as a common contributor to toxicity in marine sediment, elutriate and porewater testing. In our study, the role of ammonia as a possible toxicant in sediment toxicity tests was evaluated using larvae of the surf clam, Spisula solidissima. Elutriates were prepared and tested using six baseline sediment samples. Ammonia was then purged from aliquots of the baseline sediment samples prior to elutriate preparation. Finally, ammonia was spiked into aliquots of the purged elutriates to mimic ammonia concentrations measured in the baseline elutriates. Toxicity was present in all of the baseline samples and was removed in the ammonia purged samples. In most cases, toxicity was comparable in the ammonia spiked samples to levels measured in the baseline samples. Water only toxicity tests revealed that larvae of the surf clam are one of the more ammonia sensitive marine species. The LC50 for survival was 10.6?mg/L total ammonia (.53?mg/L unionized ammonia) and the EC50 for shell development was 2.35?mg/L total ammonia (.12?mg/L unionized ammonia). Toxicity endpoints calculated from the water only ammonia toxicity test were good predictors of effects observed in the sediment elutriate tests.  相似文献   

大洋上地幔中冈瓦纳大陆岩石圈的残留物：来自南大洋海岭的证据     

周立君  马建华 《海洋地质前沿》2001

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地理学理论化的紧迫性     

RichardL.Morrill  马建华 《地理科学进展》1989,8(3):17-21

什么是地理学一切社会科学都是主观武断的社会发现,那么使地理学真正具有特色的研究对象是什么?只有回答了这个问题地理学才有理由独立,至少现在是回答该问题的时候了。我相信地理学的研究对象仍然是我在前边已经提到的三个基本概念:环境、位置和空间。  相似文献   

大洋转换断层的速度极限     

Naar  DF 王重光 《地质地球化学》1993,(2):40-42

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阿拉巴马费里油田可以通过烃类微渗漏和相关蚀变探测到     

Saun.  DF 李淑仪 《物探化探译丛》1990,(6):31-34

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Modeling multiscale heterogeneity and aquifer interconnectivity   总被引：2，自引：0，他引：2  

Proce CJ  Ritzi RW  Dominic DF  Dai Z 《Ground water》2004,42(5):658-670

A number of methods involving indicator geostatistics were combined in a methodology for characterizing and modeling multiscale heterogeneity. The methodology circumvents sources of bias common in data from borehole logs. We applied this methodology to the complex heterogeneity within a regional system of buried valley aquifers, which occurs in the western glaciated plains of North America and includes the Spiritwood Aquifer. The region is conceptualized as having a hierarchical organization with three facies assemblage types (large-scale heterogeneity) and two facies types within each assemblage (small-scale heterogeneity). We statistically characterized the sedimentary architecture at both scales, formulated indicator correlation models from those characterizations, and used the models to simulate the architecture in a multiscale realization. We focused on the interconnectivity of units creating higher-permeability pathways. Higher-permeability pathways span the realization even though the proportion of higher-permeability facies is less than the percolation threshold. Thus, geologic structures as represented in the indicator correlation models create interconnectivity above that which would occur if the higher-permeability facies were randomly placed. This amount of interconnection among higher-permeability facies within the multiscale realization is consistent with that suggested in prior hydraulic and geochemical studies of the regional system.  相似文献   

A Second Luminous Blue Variable in the Quintuplet Cluster     

Geballe TR  Najarro F  Figer DF 《The Astrophysical journal》2000,530(2):L97-L101

H- and K-band moderate-resolution and 4 μm high-resolution spectra have been obtained for FMM 362, a bright star in the Quintuplet Cluster near the Galactic center. The spectral features in these bands closely match those of the Pistol Star, a luminous blue variable and one of the most luminous stars known. The new spectra and previously obtained photometry imply a very high luminosity for FMM 362, L>/=106 L middle dot in circle, and a temperature of 10,000-13,000 K. Based on its luminosity, temperature, photometric variability, and similarities to the Pistol Star, we conclude that FMM 362 is a luminous blue variable.  相似文献   

利用地质雷达圈定浅部地层     

Domi.  DF 吕珍 《地震科技情报》1996,(8):34-40

为了调查浅部地层和确定雷达技术性能及其适用性，我们在四个测点上进行了地质雷达测量。所有测量均使用一套基本模拟记录系统和８０ＭＨｚ的单一天线，所有测点都有较好的地层控制，以利于评价雷达的效果，四个测点的介质成分和范围都有明显差别，在俄州西南部冰冻区的高地农场上的测点，富含粘土的土壤覆盖了较浅的基岩，雷达剖面上的一些土壤层位能够辨认出来，但仅到１．４ｍ深，在俄西南部的砂砾采石场上绘制出超过４ｍ深的不饱  相似文献