搜索结果: 91-105 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(6.297 秒)
Hydrological processes and water resources management in a dryland environment I：An introduction to the Romwe Catchment Study in Southern Zimbabwe
Hydrological processes water resources management Southern Zimbabwe
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2009/5/26
In Zimbabwe during the 1980s and early 1990s, a sequence of severe droughts caused widespread food shortages and great hardship to rural communities. The droughts exacerbated the problems of environme...
Methods for estimation loads transported by rivers
rivers loads transported North-East Scotland
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2009/5/26
Ten methods for estimating the loads of constituents in a river were tested using data from the River Don in North-East Scotland. By treating loads derived from flow and concentration data collected e...
A new approach for estimation suspended sediment yield
sediment yield sediment routine sediment concentration
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2009/5/26
A semi-distributed conceptual model, HBV-SED, for estimation of total suspended sediment concentration and yield at the outlet of a catchment was developed and tested through a case study. The base of...
长江中游的泥沙淤积问题
长江中游 泥沙淤积 泥沙资源化
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2009/5/20
长江上游年产泥沙5.12×108 t, 经宜昌输入中游, 长江中游干流及各支流年产沙约 0.80×108 t. 这两部分中约1.24×108 t沉积于中游河湖中, 4.68×108 t经大通输入下游, 沉淤于河道及长江三角洲或入海. 长江中游的泥沙, 总体是淤大于冲, 但是冲淤的地理分布、时间段分布和河床断面分布不均衡. 长江干流的宜昌-城陵矶段、九江-大通段冲大于淤或冲淤平衡. 淤积主要发生在长...
北冰洋、白令海226Ra的分布及其水文学意义
北冰洋 白令海 226Ra 分布
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2009/5/18
中国首次北极科学考察期间(1999年7～9月), 于北冰洋、白令海分别采集了13份和20份大体积水样, 用于226Ra的分析. 结果表明, 北冰洋、白令海表层海水中226Ra含量分别介于0.28～1.56和0.25～1.26 Bq/m3之间, 平均含量分别为0.76和0.71 Bq/m3, 明显低于其他中低纬度开阔大洋表层水的数值, 说明部分研究海域受海冰融化水的影响. 白令海表层水226Ra的空...
在265个长江三角洲钻孔地层资料中识别出了冰后期海侵旋回底界面和(或)最大海侵面, 分别记录了它们的埋深值. 由此绘制出了长江三角洲冰后期沉积物等厚图及冰后期最大海侵以来的沉积物等厚图, 计算了冰后期沉积旋回及其海侵和海退层序的沉积物数量, 并且分析了其分布特征. 结果表明, 长江三角洲在冰后期及其海侵和海退期间的沉积物数量分别为17742.2×108 , 9791.9×108和7950.3×1...
The role of Lake Dongting in regulating the sediment budget of the Yangtze River
Yangtze River sediment budget Lake Dongting
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2009/5/18
Lake Dongting, the second largest freshwater lake in China and located in the middle reaches of the River Yangtze catchment, was formed at the beginning of the Holocene period by sea level rise and h...
Multi-objective calibration of the land surface scheme TERRA/LM using LITFASS-2003 data
land surface LITFASS-2003 data heat flux
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2009/5/18
The turbulent sensible and latent heat fluxes simulated in the operational weather forecast model LM have been checked with data from the field experiment LITFASS 2003 (Lindenberg Inhomogeneous Terrai...
Simulation of flood flow in a river system using artificial neural networks
Artificial neural networks flood flow neural networks
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2009/5/18
Artificial neural networks (ANNs) provide a quick and flexible means of developing flood flow simulation models. An important criterion for the wider applicability of the ANNs is the ability to genera...
A conceptual glacio-hydrological model for high mountainous catchments
conceptual glacio-hydrological model high mountainous catchments
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2009/5/18
In high mountainous catchments, the spatial precipitation and therefore the overall water balance is generally difficult to estimate. The present paper describes the structure and calibration of a sem...
Faecal sterols as indicators of sewage contamination in estuarine sediments of the Tay Estuary, Scotland：an extended baseline survey
Faecal sterols sewage contamination estuarine sediments
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2009/5/18
Sterol ratios are used to identify sources, occurrence and partitioning of faecal matter in sediments of the Tay Estuary, Scotland. The 5β/(5α+5β) ratio is used to discriminate between sewage and biog...
Factors influencing fluffy layer suspended matter (FLSM) properties in the Odra River - Pomeranian Bay - Arkona Deep System (Baltic Sea) as derived by principal components analysis (PCA), and cluster analysis (CA)
fluffy layer suspended matter Odra River Arkona Deep System principal components analysis cluster analysis
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2009/5/18
Factors conditioning formation and properties of suspended matter resting on the sea floor (Fluffy Layer Suspended Matter - FLSM) in the Odra river mouth - Arkona Deep system (southern Baltic Sea) wer...
Consumptive water use to feed humanity - curing a blind spot
Consumptive water blind spot water demands
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2009/5/18
Since in large parts of the world it is getting difficult to meet growing water demands by mobilising more water, the discourse has turned its focus to demand management, governance and the necessary ...
Forward Modeling and validation of a new formulation to compute self-potential signals associated with ground water flow
porous media hydroelectrical flow electrical current density water flow
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2009/5/14
The classical formulation of the coupled hydroelectrical flow in porous media is based on a linear formulation of two coupled constitutive equations for the electrical current density and the seepage...
Riverine transport of biogenic elements to the Baltic Sea – past and possible future perspectives
biogenic elements Riverine transport Baltic Sea
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2009/5/14
The paper reviews critical processes for the land-sea fluxes of biogenic elements (C, N, P, Si) in the Baltic Sea catchment and discusses possible future scenarios as a consequence of improved sewage...