期刊文献+
共找到26篇文章
< 1 2 >
每页显示 20 50 100
基于经验模态分解的泸定6.8级地震地下水流量异常识别
1
作者 尤宝鑫 刘爱春 +2 位作者 刘冠中 范良龙 方创首 《华北地震科学》 2024年第2期59-64,共6页
基于2022年9月5日12时52分泸定6.8级地震,通过经验模态分解(EMD)方法对西昌、昭觉和盐源台站流量观测数据进行分析处理,发现3个台站异常出现时间集中在震前4~5天左右的短临阶段,异常变化形态均表现为“上升-下降-上升”类型,且西昌、昭... 基于2022年9月5日12时52分泸定6.8级地震,通过经验模态分解(EMD)方法对西昌、昭觉和盐源台站流量观测数据进行分析处理,发现3个台站异常出现时间集中在震前4~5天左右的短临阶段,异常变化形态均表现为“上升-下降-上升”类型,且西昌、昭觉和盐源台站的流量异常频段分别为3.5×10^(-7)~3.8×10^(-6) Hz、3.5×10^(-7)~3.5×10^(-6) Hz和3.8×10^(-7)~3.4×10^(-6) Hz。结果表明,EMD方法有效提高了地震前流量异常信息的获取能力,在地下水流量异常特征识别与信号分析方面具有较好的应用前景。 展开更多
关键词 泸定6.8级地震 地下水流量 经验模态分解 异常识别
下载PDF
河流水位与地下水流量联合效应对河岸稳定性分析
2
作者 丁培 《水利科技与经济》 2023年第11期40-43,共4页
现有河岸稳定性模型在一些简化假设下考虑了孔隙水压力的影响,因而在预测能力上存在一定局限性。为避免孔隙水压力分布估算与现实不符的情况,提出将河岸稳定性与地下水流建模相结合,并将其应用于解决河流水位与地下水位之间的联合效应... 现有河岸稳定性模型在一些简化假设下考虑了孔隙水压力的影响,因而在预测能力上存在一定局限性。为避免孔隙水压力分布估算与现实不符的情况,提出将河岸稳定性与地下水流建模相结合,并将其应用于解决河流水位与地下水位之间的联合效应。同时,为考虑河岸材料特性和入渗的影响,对地下水流进行模拟。模拟结果表明,河岸在下落阶段易发生破坏;河岸材料特性是河岸破坏发生的主要因素。参数结果表明,在下落阶段,低渗透或高产水率土质、入渗强度大的河岸有失稳的倾向。 展开更多
关键词 河岸稳定性 地下水流量 孔隙水压力 河流水位
下载PDF
澜沧—耿马地震前地下水流量动态的异常特征 被引量:5
3
作者 王安滨 万登堡 +1 位作者 杨国军 黄振义 《西北地震学报》 CSCD 1991年第2期39-44,共6页
本文在分析云南澜沧—耿马强震前地下水流量动态异常变化特征的基础上,对其形成的力学机制进行了探讨。得到的结论是,地下水流量对区域构造应力活动及地震活动具有非常灵敏的反映能力。其异常变化多出现在短临阶段,在时间上表现出集中性... 本文在分析云南澜沧—耿马强震前地下水流量动态异常变化特征的基础上,对其形成的力学机制进行了探讨。得到的结论是,地下水流量对区域构造应力活动及地震活动具有非常灵敏的反映能力。其异常变化多出现在短临阶段,在时间上表现出集中性,在区域分布上表现出普遍性和不均一性,在表现形式上则具有多样性和复杂性。随着震中距的改变异常变化量显示出一定的规律。 展开更多
关键词 地震 前兆 地下水流量 异常
下载PDF
保角映射对地下水流量计算公式的推导
4
作者 李炎年 《石家庄经济学院学报》 1988年第3期68-81,共14页
本文利用保角映射的性质来推导地下水流量的计算公式。这里所指的保角映射是在某区域内单叶的解析函数 W=f(z)(f′(z)≠0),每一个使f′(z)≠0的点具有角度的大小与方向的不变性与伸长度的固定性。文章开头先论证一条线积分变量替换的引... 本文利用保角映射的性质来推导地下水流量的计算公式。这里所指的保角映射是在某区域内单叶的解析函数 W=f(z)(f′(z)≠0),每一个使f′(z)≠0的点具有角度的大小与方向的不变性与伸长度的固定性。文章开头先论证一条线积分变量替换的引理,然后说明如何利用保角映射来推导地下水流量的计算公式,并举例说明利用这种方法来计算地下水的流量有它的方便之处,有时比设置“虚井”来得快,而且还可以得出一些用设置“虚井”不易,甚至不可能得到的结果,不足之处是难以找到合要求的保角映射。 展开更多
关键词 保角映射 地下水流量 计算公式 解析函数 线积分 单连通区域 粘滞系数 拉普拉斯方程 变量替换 保角变换
下载PDF
暗沟的地下水流量及降落曲线方程
5
作者 张双艳 《黑龙江交通科技》 2012年第2期34-34,36,共2页
从渗流的流量与流速、完整式渗沟、含水层无限的不完整式渗沟、含水层有限不完整式渗沟和渗井几个方面介绍了暗沟的地下水流量及降落曲线方程。
关键词 暗沟 地下水流量 降落曲线方程
下载PDF
南水北调中线总干渠逆止阀处地下水进入量及其对干渠水质影响分析——以焦作某内排段为例 被引量:3
6
作者 任仲宇 薛潇 +2 位作者 高安虎 荀继萍 巩奕成 《北京工业大学学报》 CAS CSCD 北大核心 2015年第2期281-286,共6页
为保障南水北调中线总干渠水质安全,以河南焦作某内排段为研究对象,基于GMS地下水数值模拟系统对逆止阀处地下水流向流线、进入量及其对干渠水质影响进行了模拟分析.由8种水量情景模拟结果得出:逆止阀处地下水进入量主要受地下水和总干... 为保障南水北调中线总干渠水质安全,以河南焦作某内排段为研究对象,基于GMS地下水数值模拟系统对逆止阀处地下水流向流线、进入量及其对干渠水质影响进行了模拟分析.由8种水量情景模拟结果得出:逆止阀处地下水进入量主要受地下水和总干渠水位差的影响,二者呈正相关.以SO2-4、NH3-N、NO3-N为分析因子,假定总干渠水质类别为Ⅱ类水,通过最差情况分析得出:地下水经逆止阀进入总干渠后,干渠水中SO2-4、NH3-N、NO3-N浓度值均超标,水质类别降为Ⅲ类水.采用逆推法分析得出:当干渠水中SO2-4、NH3-N、NO3-N质量浓度分别不超过221.676 8、0.067 9、9.083 2 mg/L时,即便污染的地下水通过逆止阀进入到总干渠,也能保证干渠水符合Ⅱ类水质标准. 展开更多
关键词 南水北调中线 内排段 逆止阀 GMS 地下水流量
下载PDF
云南漾濞Ms6.4级地震前滇14井流量异常分析 被引量:1
7
作者 起卫罗 曾庆堂 李宗兴 《高原地震》 2021年第3期20-25,共6页
通过对云南省保山市滇14井流量测项观测资料的初步分析,发现云南漾濞Ms6.4级地震前滇14井记录到了十分显著的短临异常,异常持续时间为5~10天。对比同井其它测项观测资料,流量观测异常明显优于其它测项。从其岩土力学机制和水动力学机制... 通过对云南省保山市滇14井流量测项观测资料的初步分析,发现云南漾濞Ms6.4级地震前滇14井记录到了十分显著的短临异常,异常持续时间为5~10天。对比同井其它测项观测资料,流量观测异常明显优于其它测项。从其岩土力学机制和水动力学机制探讨对流量动态能够灵敏映震的原因。建议在我国地震地下水动态观测中应强化地下水流量的观测与研究。 展开更多
关键词 漾濞地震 地下水流量 异常特征
下载PDF
用衰减方程计算岩溶地下水量的新方法 被引量:2
8
作者 施鑫源 《吉林大学学报(地球科学版)》 EI CAS 1982年第1期91-96,共6页
为了估算岩溶地区的地下水量,首先必须调查分析流域内岩溶的分布规律及其同地质构造特征的密切关系,同时尚需掌握测定岩溶泉水和地下暗河的流量和水位资料,观测和分析岩溶泉水与地下暗河流量特征。这些对评价岩溶地区地下水资源是十分... 为了估算岩溶地区的地下水量,首先必须调查分析流域内岩溶的分布规律及其同地质构造特征的密切关系,同时尚需掌握测定岩溶泉水和地下暗河的流量和水位资料,观测和分析岩溶泉水与地下暗河流量特征。这些对评价岩溶地区地下水资源是十分必要的,因为地下水流量本身就是地下水资源的主要构成部分。但由于岩溶分布区域的复杂性,如何评价这类地区的地下水资源,国内外尚无成熟公认的办法。 展开更多
关键词 岩溶地下 地下水流量 岩溶分布 地质构造特征 岩溶地区 分布规律 地下水量 主要构成部分 地下水储存量 岩溶泉
下载PDF
土压平衡盾构渗流场解析解及喷涌判别研究 被引量:1
9
作者 余俊 郑靖凡 +1 位作者 杨鑫歆 李东凯 《岩土力学》 EI CAS CSCD 北大核心 2023年第S01期572-580,共9页
考虑土压平衡盾构土舱的二维渗流效应,用解析方法分析了土压平衡盾构的喷涌问题。将土舱渗流场划分成两个区域,利用分离变量法并结合区域间连续条件得到土舱水头显式级数解,将螺旋输送机内流场视为一维渗流,通过土舱与螺旋输送机交界面... 考虑土压平衡盾构土舱的二维渗流效应,用解析方法分析了土压平衡盾构的喷涌问题。将土舱渗流场划分成两个区域,利用分离变量法并结合区域间连续条件得到土舱水头显式级数解,将螺旋输送机内流场视为一维渗流,通过土舱与螺旋输送机交界面水流量及水头连续条件得到盾构的渗流场解析解。分别将土舱和螺旋输送机渗流场解析解与数值软件计算结果和试验结果进行对比,结果吻合较好,验证了解的正确性。分析盾构及土层参数对螺旋输送机排土口水流量及水压力的影响,分析结果表明:在螺旋输送机排土口内外水压力差为0的情况下,螺旋输送机内水流量及水压力与刀盘面中心水头近似线性关系;增加螺旋输送机长度和倾角、减小螺旋输送机的直径有利于防止喷涌。基于已有的喷涌研究成果,给出了典型盾构喷涌判别图。通过对盾构喷涌实例进行判别,并与盾构一维解析解的喷涌判别结果进行对比,证明基于本解析解的喷涌判别更为准确。 展开更多
关键词 土压平衡盾构 喷涌 地下水流量 水压力 螺旋输送机
下载PDF
对地下水资源量计算所用资料系列长度的商榷
10
作者 武桂梅 张稳柱 《山西水利科技》 1997年第2期18-19,共2页
文中通过长系列地下水多年平均可开采量,短系列地下水可开采量与近年实际开采量的比较,得出结论:由于受气候和补给条件等因素的影响,长系列资料推算出的地下水资源量一般偏大,在实际工作中只能用于宏观调控,在微观管理中,并不适... 文中通过长系列地下水多年平均可开采量,短系列地下水可开采量与近年实际开采量的比较,得出结论:由于受气候和补给条件等因素的影响,长系列资料推算出的地下水资源量一般偏大,在实际工作中只能用于宏观调控,在微观管理中,并不适用。由短系列资料计算的成果,既可反映近期气候影响,又可体现现状补给条件的变化,能充分反映出计算区域所面临的水资源状况,较准确地指导水资源管理工作。 展开更多
关键词 地下水资源 地下水流量 资料系列 水资源调查
下载PDF
使用带有脉冲点源多针探头进行土壤热测量 被引量:1
11
作者 T.H.Larson 金志翰 《地球物理学进展》 CSCD 1989年第1期83-86,共4页
一、引言浅坑测温早已被认为是快速勘测浅含水层的有效方法(Cartwright,1968)。使用这个方法的不足之处是需要另外测量热性质以便正确地解释温度异常。在这个工作中重要的热性质是热扩散率κ(cm^2/s),它被定义成是热导率研K[cal/(cm... 一、引言浅坑测温早已被认为是快速勘测浅含水层的有效方法(Cartwright,1968)。使用这个方法的不足之处是需要另外测量热性质以便正确地解释温度异常。在这个工作中重要的热性质是热扩散率κ(cm^2/s),它被定义成是热导率研K[cal/(cm·s·℃)]和热容量C[cal/(cm^3·℃)]之比。笔者设计了一个不但可以迅速、直接地测量土壤热导率。 展开更多
关键词 热测量 热扩散率 外测量 脉冲源 温度分布 地下水流量 温度异常 阶梯函数 抽水井 专利登记
下载PDF
稳定流单井抽水实验水文地质参数确定及涌水量预测 被引量:1
12
作者 刘广涛 《广东科技》 2006年第2期150-151,共2页
关键词 水文地质参数 抽水实验 涌水量预测 参数确定 稳定流 地下室底板 单井 地下水流量 工程概况 商住小区
下载PDF
对碾子沟水库坝后漏水的探讨
13
作者 陈明 《吉林水利》 1996年第12期21-22,共2页
对碾子沟水库坝后漏水的探讨永吉县碾子沟水库陈明碾子沟水库,是建在二松流域,鳌龙河支流一拉溪河上游的一项控制性工程。位于永吉县西部一拉溪镇南6km处。水库上游的控制面积为78.5km2,总库容1.355万m3,兴利库容... 对碾子沟水库坝后漏水的探讨永吉县碾子沟水库陈明碾子沟水库,是建在二松流域,鳌龙河支流一拉溪河上游的一项控制性工程。位于永吉县西部一拉溪镇南6km处。水库上游的控制面积为78.5km2,总库容1.355万m3,兴利库容1.245万m3,实行多年调节。水... 展开更多
关键词 地下水压力 地下水流量 水库除险 碾子 老河道 水流方向 水库大坝 透水带 工程措施 透水层
下载PDF
雨水资源的收集利用
14
作者 S.艾哈迈德 毛红梅(编译) 付湘宁(编译) 《水利水电快报》 2012年第9期11-12,共2页
利用雨水收集系统可以补充地表水和地下水资源的匮乏,同时还可以减轻气候变化对供水产生的影响。目前很多地区对雨水收集系统的兴趣越来越大,特别是那些雨水全年分布较均匀、地表水较缺乏、地下水已矿化、集中供水管道供应能力不足的乡... 利用雨水收集系统可以补充地表水和地下水资源的匮乏,同时还可以减轻气候变化对供水产生的影响。目前很多地区对雨水收集系统的兴趣越来越大,特别是那些雨水全年分布较均匀、地表水较缺乏、地下水已矿化、集中供水管道供应能力不足的乡村地区。收集、利用雨水既经济,又能替代其他形式的水资源,减少冲刷和暴雨径流,改善水质。 展开更多
关键词 水资源 地下水流量 雨水保护
下载PDF
Detecting Changes in Precipitation and Temperature Extremes over China Using a Regional Climate Model with Water Table Dynamics Considered 被引量:1
15
作者 QIN Pei-Hua XIE Zheng-Hui WANG Ai-Wen 《Atmospheric and Oceanic Science Letters》 CSCD 2014年第2期103-109,共7页
Simulations were conducted with the regional climate model RegCM incorporating water table dynamics from 1 September 1982 to 28 August 2002 to detect precipitation and temperature extremes. Compared with observed r10(... Simulations were conducted with the regional climate model RegCM incorporating water table dynamics from 1 September 1982 to 28 August 2002 to detect precipitation and temperature extremes. Compared with observed r10(number of days with precipitation ≥ 10 mm d–1), RegCM3_Hydro(the regional climate model with water table dynamics considered) simulated rain belts, including those in southern China and the middle and lower reaches of the Yangtze River, and provided data for arid to semi-arid areas such as the Heihe River Basin in northwestern China. RegCM3_Hydro indicated a significant increasing trend of r95p(days with daily precipitation greater than the 95th percentile of daily amounts) for the Yangtze, Yellow, and Pearl River basins, consistent with r95p observations. The Haihe River Basin was also chosen as a specific case to detect the effect of groundwater on extreme precipitation using peaks over threshold(POT)-based generalized Pareto distribution(GPD) with parameters estimated by the L-moment method. Quantile plots showed that all but a few of the plotted points were distributed near diagonal lines and the modeled data fitted well with the samples. Finally, the effects of water table dynamics on temperature extremes were also evaluated. In the Yellow River Basin and Songhuajiang River Basin, the trends of the number of warm days(TX95n) from RegCM3_Hydro matched observed values more closely when water table dynamics were considered, and clearly increasing numbers of warm days from 1983 to 2001 were detected. 展开更多
关键词 climatic extreme GROUNDWATER RUNOFF river basin regional climate
下载PDF
Identification and Evolution of Groundwater Chemistry in the Ejin Sub-Basin of the Heihe River, Northwest China 被引量:5
16
作者 SU Yong-Hong FENG Qi +2 位作者 ZHU Gao-Feng SI Jian-Hua ZHANG Yan-Wu 《Pedosphere》 SCIE CAS CSCD 2007年第3期331-342,共12页
Hydro-chemical characteristics of groundwater and their changes as affected by human activities were studied in the Ejin Sub-Basin of the Inner Mongolia Autonomous Region, China, to understand the groundwater evolutio... Hydro-chemical characteristics of groundwater and their changes as affected by human activities were studied in the Ejin Sub-Basin of the Inner Mongolia Autonomous Region, China, to understand the groundwater evolution, to identify the predominant geochemical processes taking place along the horizontal groundwater flow path, and to characterize anthropogenic factors affecting the groundwater environment based on previous data. The concentrations of major ions and total dissolved solids (TDS) in the groundwater showed a great variation, with 62.5% of the samples being brackish (TDS ≥ 1 000 mg L^-l). The groundwater system showed a gradual hydro-chemical zonation composed of Na^+ -HCO3^-, Na^+ -Mg^2+ -SO4 ^2 -Cl^-, and Na^+ -Cl^-. The relationships among the dissolved species allowed identification of the origin of solutes and the processes that generated the observed water compositions. The dissolution of halite, dolomite, and 2- gypsum explained, in part, the presence of Na^+, K^+, Cl^-, SO^4 , and Ca^2+, but other processes, such as mixing, Na^+ exchange for Ca^2+ and Mg^2+, and calcite precipitation also contributed to the composition of water. Human activity, in particular large-scale water resources development associated with dramatic population growth in the last 50 years, has led to tremendous changes in the groundwater regime, which reflected in surface water runoff change, decline of groundwater table and degeneration of surface water and groundwater quality. Solving these largely anthropogenic problems requires concerted, massive and long-term efforts. 展开更多
关键词 Ejin Sub-Basin groundwater quality Heihe River human impact water resources development
下载PDF
A Modified Groundwater Module in SWAT for Improved Streamflow Simulation in a Large, Arid Endorheic River Watershed in Northwest China 被引量:6
17
作者 JIN Xin HE Chansheng +1 位作者 ZHANG Lanhui ZHANG Baoqing 《Chinese Geographical Science》 SCIE CSCD 2018年第1期47-60,共14页
Interactions between surface water and groundwater are dynamic and complex in large endorheic river watersheds in Northwest China due to the influence of both irrigation practices and the local terrain. These interact... Interactions between surface water and groundwater are dynamic and complex in large endorheic river watersheds in Northwest China due to the influence of both irrigation practices and the local terrain. These interactions interchange numerous times throughout the middle reaches, making streamflow simulation a challenge in endorheic river watersheds. In this study, we modified the linear-reservoir groundwater module in SWAT(Soil and Water Assessment Tools, a widely used hydrological model) with a new nonlinear relationship to better represent groundwater processes; we then applied the original SWAT and modified SWAT to the Heihe River Watershed, the second largest endorheic river watershed in Northwest China, to simulate streamflow. After calibrating both the original SWAT model and the modified SWAT model, we analyzed model performance during two periods: an irrigation period and a non-irrigation period. Our results show that the modified SWAT model with the nonlinear groundwater module performed significantly better during both the irrigation and non-irrigation periods. Moreover, after comparing different runoff components simulated by the two models, the results show that, after the implementation of the new nonlinear groundwater module in SWAT, proportions of runoff components changed-and the groundwater flow had significantly increased, dominating the discharge season. Therefore, SWAT coupled with the non-linear groundwater module represents the complex hydrological process in the study area more realistically. Moreover, the results for various runoff components simulated by the modified SWAT models can be used to describe the hydrological characteristics of lowland areas. This indicates that the modified SWAT model is applicable to simulate complex hydrological process of arid endorheic rivers. 展开更多
关键词 Soil and Water Assessment Tools (SWAT) GROUNDWATER irrigation streamflow Heihe River
下载PDF
Variation characteristics of aquifer parameters induced by groundwater source heat pump operation under variable flow 被引量:5
18
作者 王松庆 张旭 《Journal of Central South University》 SCIE EI CAS 2011年第4期1272-1277,共6页
The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of buildin... The variation characteristics of aquifer parameters,induced by groundwater source heat pump(GWSHP) operation under variable flow,were theoretically analyzed through a case study,in which the characteristics of building air conditioning load were considered.The results,compared with the constant flow operation,indicate that the influence on the variations of porosity,hydraulic conductivity and confined water head is decreased by 48%,51% and 71%,respectively,under variable flow operation.The security of variable flow operation is superior to that of constant flow.It is also concluded that the climate region and function of the buildings are primary factors which affect the suitability of variable flow operation in GWSHP. 展开更多
关键词 groundwater source heat pump variation characteristic aquifer parameter variable flow
下载PDF
Groundwater Flow Modelling of Galma Basin, Nigeria: Using Finite Element Method
19
作者 I.O. Olaniyan J.C. Agunwamba J.O. Ademiluyi 《Journal of Environmental Science and Engineering》 2011年第3期247-252,共6页
The groundwater flow characteristics of the Galma River Basin were simulated numerically by using the finite element method. The two-dimensional partial differential equation governing transient flow in an unconfined ... The groundwater flow characteristics of the Galma River Basin were simulated numerically by using the finite element method. The two-dimensional partial differential equation governing transient flow in an unconfined aquifer was modified to incorporate the effect of precipitation as a measurable source as it affects groundwater flow, such that for a given amount of precipitation over the basin, the flow of groundwater can be predicted at any point in the basin. With appropriate initial and boundary conditions, the modified equation was solved and the solution programmed for computer run. After calibration and verification, the borehole hydraulic data for the basin was used to predict flow due to groundwater hydraulic heads for 20 years. Findings revealed that there is a direct correlation of 0.79 and a strong linear relationship between simulated and observed hydraulic heads, and that data availability and choice of appropriate initial and boundary conditions are significant for good numerical modelling results. The contour plot of the hydraulic heads showed variation of heads from higher values at the upstream to lower values downstream, and groundwater flow follows the natural topography of the land from the upstream end of the basin towards the main streams and Galma River. 展开更多
关键词 Groundwater flow river basin PRECIPITATION finite element hydraulic head.
下载PDF
Climate Change and Water Resources: Strategies and Practices for Improved Water Management in Arid Countries
20
作者 B. S. Choudri Mushtaque Ahmed 《Journal of Agricultural Science and Technology(A)》 2012年第3期335-344,共10页
Assessment report of the Intergovernmental Panel on Climate Change (IPCC) highlighted the complex linkages between climate change and water. The likely warmer climate induced by the climate change is set to alter hy... Assessment report of the Intergovernmental Panel on Climate Change (IPCC) highlighted the complex linkages between climate change and water. The likely warmer climate induced by the climate change is set to alter hydrological cycle and the shifting pattern of the rainfall would affect the spatial and temporal distribution of runoff, soil moisture, and surface and groundwater reserves. Therefore, there is an urgent need to assess the impacts of climate change on water and devise adaptation measures including management structures and processes by which one can deal with this challenge. The paper highlights with the global overview of climate change impacts on water in the arid region, supported and substantiated through scientific evidence drawn from IPCC reports and other relevant documents. This paper provides an overview of water resource management challenges including transboundary geopolitical concerns documented across the world and emphasizes the importance of an integrated framework for adaptive policy making. Further, it examines the viable water resource management options for various sectors and regions and showcases some of the international best practices in adaptation and mitigation. The paper also explains the complementary role of traditional knowledge in coping with climate change risks and uncertainties and the need for a balanced view in designing adaptation and mitigation strategies. 展开更多
关键词 Climate change RAINFALL water resource management adaptation.
下载PDF
上一页 1 2 下一页 到第
使用帮助 返回顶部