陈喜
主要从事地下水数值计算、地表水与地下水联合运用、陆面水文过程与气候模型耦合研究。
个性化签名
- 姓名:陈喜
- 目前身份:
- 担任导师情况:
- 学位:
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学术头衔:
博士生导师, 教育部“新世纪优秀人才支持计划”入选者
- 职称:-
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学科领域:
水文学
- 研究兴趣:主要从事地下水数值计算、地表水与地下水联合运用、陆面水文过程与气候模型耦合研究。
分别于1984、1990、1999年在河海大学获学士、硕士和博士学位。1984年8月-1987年8月,武汉水利电力大学河流工程系任助教,1990年3月-1999年1月,河海大学水文水资源系任讲师、副教授,1999年1月-2000年11月,香港中文大学地理系副研究员、博士后研究员,2000年11月-02年7月,美国University of Nebraska-Lincoln博士后研究员,2002年8月-至今,水资源开发教育部重点实验室副主任、河海大学水资源环境学院教授。
主要从事地下水数值计算、地表水与地下水联合运用、陆面水文过程与气候模型耦合研究。在水文时空尺度转化,大气-陆面、地表水-土壤水-地下水界面水通量模拟计算,以及水文过程数值化集成系统等方面取得了一系列研究成果。负责多项国家自然科学基金、省部级科研项目,发表论文40余篇,其中SCI&EI检索7篇。获省部级三等奖两项、厅级一等奖一项。2004年入选教育部“新世纪优秀人才支持计划”。为美国内布拉斯加沙丘区生物复杂性研究计划(Biocomplexity project in the Sand Hills)研究组成员,中国自然资源学会水资源专业委员会委员、美国地球物理学会(AGU)会员、国际水文科学协会IAHS会员。
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陈喜
河南大学学报,1997,6(25):92~96,-0001,():
-1年11月30日
建立了预测引黄灌区土壤含盐量、地下水水位及地下水矿化度的数学模型。其中:地壤饱和层水量水质模型中的地下水流运动微分方程溶质运移微分方程采用积分有限单元法求解:包气带中水分及含地方国营量运动模型采用分区水量盐量平衡方程求解。利用本模型。根据渠系引水量、排水沟排水量及地下水开采量等资料,就可对灌区土壤中含盐量、地下水位及地下水矿化度进行了预报。
盐碱化, 预测, 地下水位, 矿化度
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陈喜, 陈永勤
水利学报,2001,4:47~52,-0001,():
-1年11月30日
全球气候模式(GCMs)预测的气候变化情景,必须经解集模式得出小尺度上未来气候变化时空分布资料,才能满足评估气候变化对资源、环境和社会经济等影响的需要。本文提出自随机天气生成器和统计参数尺度转换关系组成的随机解集模式,应用17个站32年实测日阵雨资料,对随机解集模式进行了分析和验证。首先利用随机天气生成器,通过对站点和GDM尺度面平均阵雨系列的模拟,确定模型参数,验证模型模拟历史阵雨过程的可靠性。然后,建立模型参数从大尺度向站点转换的关系,并从历史阵雨系列中抽出某一日雨量系列假设为未来气候变化情形,对阵雨系列在不同尺度问的转换关系进行了验证。在此基础对上GCMa预测结果的时空解集方法进行了探讨
全球气候模式, 随机天气生成器, 解集
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【期刊论文】美国SandHills地区地下水数值模拟及水量平衡分析
陈喜, 陈洵洪
水科学进展,2004,1(15):94~99,-0001,():
-1年11月30日
利用地下水数值模型MODFLOW和非饱和带水平衡模型对处于半干旱湿润沙丘地区(SandHills)地下水位理行了模拟,并分析了含水层补排水量,河流与地下水补排关系,以及区域平衡过程,揭示了独特沙丘地形和土壤特性对地下水补排量的影响,模拟结果表明,入渗率大、非饱和带厚的沙丘有利于降水入渗补给,减少了地下水蒸散发损失。加上下覆含水层具有良好的地下水储水空间,是该地区储存丰富的地下水量,以维持河流稳定流量,供给众多湖泊和湿地的原因。该研究对我国地下水资源评价和生态环境脆弱地区水资源保护具有指导意义。
沙丘区, 降水入渗补给量, 地下水数值模拟, 水量平衡分析
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87浏览
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陈喜, 姜彤
水文,2004,5(24):1~6,-0001,():
-1年11月30日
根据实测气象资料和蒸散发量资料,对几种蒸散发量计算模式进行对比分析,提出不同气候区计算模式的适用性。以彭曼-蒙蒂斯公式计算的蒸散发量作为参考值,得出Φ20蒸发皿换算成蒸散发能力的折算系数。分析成果对我国水文水资源计算和进行气候变化影响评价具有重要的指导意义。
气候区, 蒸散发, 计算模式, 相关系数
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101浏览
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534下载
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陈喜, 陈洵洪
,-0001,():
-1年11月30日
本文建立非线性回归方法与地下水三维数值模型—MODFLOW相结合的优化模型利用含水层抽水试验资料确定含水层水平渗透系数Kr和储存率Ss,以及上覆弱透水层垂直渗透系数Ka和给水度Sy。通过2个示例分析模型计算过程,结果表明,该模型不仅能有效地确定这些水文地质参数,而且可以给出计算参数的误差范围和参数之间的相关程度。
抽水试验, 水文地质参数, 非线性回归, 地下水数值模型
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120浏览
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【期刊论文】Sensitivity analysis and determination of streambed leakance and aquifer hydraulic properties
陈喜, Xunhong Chen*, Xi Chen
Journal of Hydrology 284(2003)270-284,-0001,():
-1年11月30日
A nonlinear regression method is used to calculate the hydraulic parameters of a stream-aquifer system using pumping test data. Five parameters, including the horizontal hydraulic conductivity
Streambed leakance, Sensitivity analysis, Parameter estimation, Pumping test
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陈喜, Xi Chen, Xunhong Chen*
Journal of Hydrology 280(2003)246-264,-0001,():
-1年11月30日
During a flood period, stream-stage increases induce infiltration of stream water into an aquifer; subsequent declines in stream stage cause a reverse motion of the infiltrated water. This paper presents the results of the water exchange rate between a stream and aquifer, the storage volume of the infiltrated stream water in the surrounding aquifer (bank storage), and the storage zone. The storage zone is the part of aquifer where groundwater is replaced by stream water during the flood. MODFLOW was used to simulate stream–aquifer interactions and to quantify rates of stream infiltration and return flow. MODPATH was used to trace the pathlines of the infiltrated stream water and to determine the size of the storage zone. Simulations were focused on the analyses of the effects of the stream-stage fluctuation, aquifer properties, the hydraulic conductivity of streambed sediments, regional hydraulic gradients, and recharge and evapotranspiration (ET) rates on stream-aquifer interactions. Generally, for a given stream–aquifer system, larger flow rates result from larger stream-stage fluctuations; larger storage volumes and storage zones are produced by larger and longer-lasting fluctuations. For a given stream-stage hydrograph, a lower-permeable streambed, an aquitard, or an anisotropic aquifer of low vertical hydraulic conductivity can significantly reduce the rate of infiltration and limit the size of the storage zone. The bank storage solely caused by the stage fluctuation differs slightly between gaining and losing streams. Short-term rainfall recharge and ET loss in the shallow groundwater slightly influence on the flow rate, but their effects on bank storage in a larger area for a longer period can be considerable.
Flood stage, Bank storage, Storage zone, Stream-aquifer interactions
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引用
陈喜, Xunhong Chen and Xi Chen
Journal of the American Water Resources Association; Apr 2004; 40, 2; ProQuest Science Journals pg. 419,-0001,():
-1年11月30日
The Nebraska Sand Hills have a unique hydrologic system with very little runoff and thick aquifers that constantly supply water to rivers, lakes, and wetlands. A ground water flow model was developed to determine tile interactions between ground water and streamflow and to simulate the changes in ground water systems by reduced precipitation. The numerical modeling method includes a water balance model for the vadose zone and MOD- FLOW for the saturated zone. The modeling results indicated that, between 1979 and 1990, 13 percent of the annual precipitation recharged to the aquifer and annual ground water loss by evapo- transpiration (ET) was only about one-fourth of this recharge. Ground water discharge to rivers accounts tbr about 96 percent of the streamflow in the Dismal and Middle Loup rivers. When precip- itation decreased by half the average amount of the 1979 to 1990 period, the average decline of water table over the study area was 0.89 m, and the streamflow was abeut 87 percent of the present rate. This decline of the water table results in significant reduc- tions in ET directly from ground water and so a significant portion of the streamflow is maintained by capture of the salvaged ET.
Nebraska Sand Hills, ground water modeling, HighPlains Aquifer, precipitation, recharge, evapotranspiration.,
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【期刊论文】Groundwater influences on soil moisture and surface evaporation☆
陈喜, Xi Chen, Qi Hu*
Journal of Hydrology 297(2004)285-300,-0001,():
-1年11月30日
Soil hydrological processes play an important role in land-atmosphere system. In most climate models, these processes are described by soil moisture variations in the first 2 m of soil resulting from precipitation, evaporation, and transpiration. Groundwater effects on soil moisture variations and surface evaporation are either neglected or not explicitly treated. Although groundwater may have a small effect on soil moisture in areas with a deep groundwater table, groundwater can act as a soil water source and have substantial effects in areas where the water table is near or within a model's soil column. How groundwater affects soil moisture, its vertical distribution, as well as the surface water flux are the issues addressed in this study. A soil hydrological model was developed to include groundwater effects by allowing water exchange between the unsaturated zone and groundwater. The model uses a vertically varying saturation hydraulic conductivity, and is evaluated using observations at one station in the Nebraska Sand Hills. Model results show its ability to describe the roles of groundwater in maintaining the observed soil moisture, especially in deep layers. In addition, comparisons show that the soil moisture content in the first meter of the soil column from the model with groundwater is 21% greater than that from a model without groundwater. High soil moisture content in the root zone result s in increased evapotranspiration (ET). The average ET in three periods from 1998 to 2000 is 7–21% higher when groundwater is considered in the model. Because of the groundwater effects, spatial variations in the groundwater table can create an additional spatial variability of soil moisture and surface water flux. This additional variability could be important in development of storms in regions whose domain has a large portion with high groundwater table.
Groundwater, Soil moisture, Surface evaporation, Model, Nebraska Sand Hills
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【期刊论文】GEOLOGICAL AND CLIMATIC CONTROLS ON STREAMFLOWS IN THE NEBRASKA SAND HILLS1
陈喜, Xi Chen, Xunhong Chen, Clinton Rowe, Qi Hu, and Mark Anderson
Journal of the American Water Resources Association; Feb 2003; 39, 1; ProQuest Science Journals pg. 217,-0001,():
-1年11月30日
This paper presents hydrological characteristics of the streamflow of the Dismal, Middle Loup, North Loup, and Cedar Rivers in the Nebraska Sand Hills and their relation to climate and ground water variation. Time series of streamflow, precipitation, temperature, and ground water levels from 1976 to 1998 were used to analyze trends and fluctuations of streamflow and to determine relationships among streamflow, climate, and the ground water system. An increase of precipitation and a decrease of maximum temperature over the period resulted in higher ground water levels and increased treamflow in the region. The high permeability of the soil and the thick unsaturated zone enhance precipitation recharge, limit surface runoff, and prevent ground water losses through evapotranspiration. Thus, an abundance of ground water is stored, supplying more than 86 percent of streamflow in the four rivers. Streamflow is generally more constant in the Sand Hills than elsewhere in the region. The four rivers present different hydrologic characteristics because of the spatial heterogeneity in hydrogeologic conditions. Streamflow of the Dismal and Middle Rivers, which are less sensitive to climatic variation, is much stead-ier than that of the North Loup and Cedar Rivers.
Sand Hills, streamflow fluctuation, climate varia-tion, ground water accumulation, statistical analysis, hydrogeolo-gy.,
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