搜索结果: 61-75 共查到“知识库 河流学与河口水文学”相关记录211条 . 查询时间(1.439 秒)
LINEAR GEOSTATISTICAL MODELS FOR ESTIMATING GROUNDWATER QUALITY VARIABLES
regional groundwater quality mapping problems
2009/10/13
Geostatistics provides set of probabilistic techniques, which are useful to detect and find the mode of patterns of spatial dependence of attribute values in space, and further use these models for th...
CHEMICAL AND ISOTOPIC COMPOSITION OF WATER FROM SPRINGS AND WELLS IN THE DAMOUR RIVER BASIN AND THE COASTAL PLAIN IN LEBANON
spring waters groundwater resources coastal Mediterranean plain
2009/10/12
A hydrochemical and isotopic study was carried out on spring waters of the Damour River Basin and groundwaters from wells in the coastal Mediterranean plain in Lebanon. The aim of this study was to de...
SIMPLIFIED HYDROLOGIC CORRELATIONS TO FORECAST THE NATURAL REGIME OF LAKE CHAPALA
water supply Lake Chapala hydrologic
2009/10/12
Lake Chapala is the most important lake in Mexico and the main water supply for Guadalajara, the second biggest city in the country. Presently the lake contributes more than 65% of the daily water nee...
LABORATORY SIMULATION OF A GEOMORPHOLOGICAL RUNOFF ROUTING MODEL USING LIQUID ANALOG CIRCUITS
Artificial Neural Network river management precipitation modeling
2009/10/12
The first step in a river management program is precipitation modeling over the watershed. Considering the high stochastic property of the process, many models are still being developed to define this...
通过分析长江口外海域不同区域有机碳和氮的分布特征及其影响因素,了解了底部沉积物中有机碳和氮同位素的生物地球化学特征,探讨二者对长江口外海域底部沉积物中有机物来源的指示意义。运用质量混合模型,计算了长江输入的陆源有机物的贡献及其空间变化。结果表明,长江口外海域沉积物中TOC和TN的分布和东海陆架的环流体系有着密切关系,与环流的分布相对应,如果大致沿31oN和123oE作为分界线, 整个研究区的TOC...
近10年来长江口水下三角洲的冲淤变化——兼论三峡工程蓄水的影响
长江 三峡工程 水下三角洲 冲淤演变
2009/9/17
根据对近10年来长江入海泥沙量和河口冲淤的对比分析,探讨水下三角洲冲淤对长江入海泥沙锐减以及三峡工程运行的响应。结果表明:(1) 三峡水库蓄水导致长江入海泥沙减少1×108 t/a量级;(2) 1995-2000年、2000-2004年和2004-2005年研究区淤积 (冲刷) 面积分别占75.5% (24.5%)、30.5% (69.5%) 和14% (86%),垂向冲淤速率 (负为冲刷) 分...
健康河流是指在相应一定时期其社会功能与自然功能和谐并能够均衡发挥的河流,其标志是具有良好的水质、水沙流畅的河床与可维系的河流生态系统。河流健康的指示性因子应是能够基本反映河流自然功能的因子,包括河床形态、水质、河流生态和河川基流,但因子的种类和数量因河而异, 其量化标准的确定则要充分考虑河流自然功能和社会功能均衡发挥的需要和河流水情背景条件的变化。河流健康的核心是有相应足够而洁净的河川径流,因此保...
塔里木河下游间歇性输水对土壤水化学的影响
地下水化学 地下水埋深 塔里木河
2009/9/16
根据塔里木河下游2000-2006年11次间歇性输水影响下沿输水河道两侧地下水埋深、地下水化学组分变化的资料, 结合有关输水的基本资料和土壤盐分含量变化的适时监测数据,分析了地下水化学特征的变化及影响其变化的各相关因子,结果表明:地下水化学特征的变化呈现明显的阶段性规律, 地下水化学组分的变化与距离输水河道的远近、地下水埋深、河道径流量以及土壤盐分含量之间具有较高的相关性; 地下水埋深在5 m及5...
特枯水情对长江中下游悬浮泥沙的影响
长江 特枯水情 含沙量 悬沙粒径
2009/9/16
基于长江中下游气象资料、历史水沙资料和2006年10月现场水沙观测资料,分析了典型枯水年大通站的月均径流量和输沙率特征、2006年特枯水情产生的气候背景以及对长江中下游含沙量和悬沙粒径产生的影响。分析表明,枯水年长江干流输沙量有显著的减少,2006年特枯水情下大通站汛期输沙量仅占多年平均值 (1985-2000年) 的19.8%。在特枯水情和三峡工程蓄水的背景下,2006年10月长江中下游含沙量平...
不同电子受体及盐分输入对河口湿地土壤甲烷产生潜力的影响
电子受体 盐分 河口湿地土壤 甲烷产生
2009/9/16
对闽江河口芦苇(Phragmites australis)湿地土壤甲烷产生潜力及电子受体(硝酸盐,三价铁和硫酸盐)及盐分(氯化钠)输入对其的影响进行了厌氧培养实验及测定。结果表明,芦苇湿地土壤甲烷产生潜力范围是00202~00871 μg〖KG-*3〗·〖KG-*4〗g-1〖KG-*3〗·〖KG-*4〗d-1,0~10 cm土壤甲烷产生潜力最大;电子受体及盐分的输入对土壤甲烷...
长江上游干支流悬移质含沙量的变化及其原因
悬移质含沙量 水沙变化 水土保持 长江上游
2009/9/16
河流含沙量的变化是流域自然与人文因子变化的反映。以长江上游干支流1956~2000年的水沙和降水资料为基础,运用时间系列分析和统计分析方法进行研究。研究发现,干流宜昌站和4条主要支流含沙量的变化不是同步的,4条主要支流含沙量的变化呈现出复杂变化图形。流域面平均年降水量的变化,仅能解释含沙量变化的1586%~3721%,说明气候因素的变化不是长江干支流含沙量变化的主要原因。运用双累积曲线分析方法...
Agricultural-to-hydropower water transfers: sharing water and benefits in hydropower-irrigation systems
hydropower water transfers water resources systems agricultural
2009/7/22
This paper presents a methodology to assess agricultural-to-hydropower water transfers in water resources systems where irrigation crop production and hydropower generation are the main economic activ...
A look at the links between drainage density and flood statistics
drainage density flood statistics
2009/7/22
We investigate the links between the drainage density of a river basin and selected flood statistics, namely, mean, standard deviation, coefficient of variation and coefficient of skewness of annual...
HESS Opinions “Urgent water challenges are not sufficiently researched”
Urgent water challenges sufficiently researched HESS Opinions
2009/7/22
In this opinion paper we submit that water experts conduct comparatively little research on the more urgent challenges facing the global community. Five specific biases are identified. First, researc...
Quantifying the effect of land use and land cover changes on green water and blue water in northern part of China
land use green water land cover changes blue water
2009/7/22
Changes in land use and land cover (LULC) have been occurring at an accelerated pace in northern parts of China. These changes are significantly impacting the hydrology of these parts, such as Laohahe...