R/S分析在大气降水丰枯变化趋势预测中的应用

根据大气降水丰枯变化的实测资料，利用R/S分析的原理和方法计算了H指数，建立了R(i)/S(i)与i的关系式，对大气降水的丰枯变化趋势进行了预测分析。结果表明，大气降水丰枯变化趋势预测是一条较为有效的途径。     

面状基坑潜水完整井轻型井点的应用

文章较详细地介绍了面状基坑潜水完整井轻型井点的使用及计算方法,为同类工程施工提供一定参考经验。     

宝鸡市近55年气候变化特点

使用1953--2008年宝鸡市降水和气温资料，采用温度异常度、降水距平、多元回归、差异显著性检验等方法，对宝鸡气候变化进行分析，结果表明：近15年来，年平均气温明显升高，年降水明显减少，特别是以春季气温升高和降水减少最为显著。气候变化以变暖为主要特征，温度变化是直接和主动的，而降水的的变化是间接和被动的，是对温度变化的响应。     

Cloud microphysical and rainfall responses to zonal perturbations of sea surface temperature: A cloud-resolving modeling study

The cloud microphysical and rainfall responses to zonal perturbations of sea surface temperature (SST) are investigated by analyzing the equilibrium simulation data (from day 31–40) obtained from a series of two-dimensional cloud-resolving simulations with a zonal model domain of 768 km. Four experiments imposed by zonal SST perturbations of wavenumbers 1 (SST29Z1), 2 (SST29Z2), 4 (SST29Z4), and 8 (SST29Z8) are compared to the control experiment imposed by zonally uniform SST (SST29). The model domain mean SST is 29 C, and the two-dimensional cloud-resolving model with a cyclic lateral boundary is also imposed by zero vertical velocity and constant zonal wind. The time and model domain mean surface rain rates in SST29Z1, SST29Z2, and SST29Z8 are about 10% larger than those in SST29, whereas the mean surface rain rates in SST29Z4 and SST29 are similar. The analysis of mean surface rainfall budgets shows that local water vapor and hydrometeor changes play important roles in determining the differences and similarities in mean surface rain rate between the perturbation experiments and the control experiment. Both convective and stratiform rain rates are larger in SST29Z1 and SST29Z2 than in SST29 due to the smaller advection of rain from convective regions into raining stratiform regions and the larger vapor condensation rates associated with the larger water vapor convergence over raining stratiform regions in SST29Z1 and SST29Z2. The convective rain rates are larger in SST29Z4 and SST29Z8 than in SST29 because of the larger condensation rates associated with the larger water vapor convergence over convective regions in SST29Z4 and SST29Z8. The stratiform rain rates in SST29Z4 and SST29Z8 are smaller than in SST29 due to the smaller vapor condensation rates and smaller collection rates of cloud water by rain over raining stratiform regions in SST29Z4 and SST29Z8.     

浅谈轻型井点降水施工工艺

轻型井点系在基坑外围或一侧、二侧埋设井点管深入含水层内,井点管的上端通过连接弯管与集水总管连接,集水总管再与真空泵和离心水泵相连,启动抽水设备,地下水便在真空泵吸力的作用下,经滤     

九江年降水时间序列的混沌特性

针对近百年来九江年降水时间序列资料，应用分形理论，探讨了不同嵌入相空间下时间序列关联维的变化规律。计算得到了其饱和关联维数ｄ＝５．０８，最低嵌入维ｍ＝９以及Ｋｏｌｏｍｏｇｏｒｏｖ熵ｋ＝０．４５２。结果表明，九江年降水时间序列是一混沌序列。从而，为进一步建立年降水预测预报模型奠定了基础。     

基础施工降水对周边建筑物影响的论证

本论证主要是对基础施工降水过程中，由于地下水位的下降，对周边筑物的安全是否有影响。本文结合黑龙江省农业发展银行综合楼基础施工降水，对周边建筑物的影响程度加以论证，以便在以后的降水工程中应着重考虑的问题及施工要求和工艺方法。     

试析气候变化在昆仑山-阿尔金山北坡河流的水文效应——以车尔臣河年径流量变化为例

车尔臣河发源于昆仑山-阿尔金山北坡，集水面积24692km^2，河源分布有6973m的木孜塔格峰，该河流经且末县处设有且末水文站，是新疆巴州南部包括昆仑山-阿尔金山在内的339170km^2行政区域唯一水文站。本文对影响车尔臣河年径流量的降水气温因素进行了趋势、周期变化分析，结果显示自1986年以来呈暖湿态势（冬季呈暖冬），接着分析了降水气温变化对车尔臣河年径流量的影响以及暖湿和暖冬趋势对车尔臣河未来径流形成机制的可能影响。     

晋南丘陵旱地小麦不同降水模拟条件下土壤水分变化规律的研究

在万荣试区丘陵旱地麦田上,500mm降水可基本满足小麦前期、中期需水,后期表现缺水,是旱地小麦丰欠的临界值;400mm降水在拔节时水分已严重不足,从开花前后开始整个土层即处于凋萎值以下,维持生长主要靠中后期不参与土壤水分循环的间隙性少量降水.本试验600mm降水亩产近400千克,但该降水量仍不是继续高产的上限值,深厚黄土的良好蓄水保水特性与生产潜力尚待进一步开发.     

青藏高原降水中δ^18O时空分布特征初探

青藏高原大气降水中δ＾１８Ｏ的时空分布表现出不同的变化规律：从时间变化过程看，沱沱河、德令哈、西宁三站的δ＾１８Ｏ与温度存在一定程度的正相关，且随时间尺度的增加，这种相关关系更加密切；从空间变化过程看，青藏高原的平均δ＾１８Ｏ自南向北基本上呈上升之势，这与温度的变化正好相反，不同源地的水汽对青藏高原降水中δ＾１８Ｏ有显著的影响作用。