Based on the water resources survey of Shanghai in 1999 and the 1:50 000 color infrared aerial photos obtained in early 2000, a case study of the upper Huangpu River was carried out. The exponential method, pair-sample t test, and remote sensing analysis are used to analyze water environmental characteristics and land use pattern in the river network plain. In order to explore response of water quality in the waterhead region to the changes in land use and its driving force, five land use patterns are selected and a new type of exponential is designed.

以黃浦江上游水源地為例黄片一级片无码视频在线观看，利用1999年上海水資源普查數據及2000年初成像的上海市1：50000彩紅外航空像片，采用GIS空間分析技術美女黄18岁以下禁看、灰色關聯分析技術影音先锋不卡成人资源在线观看，劃分土地利用樣帶，設計水質改善指數北京免费毛片，探討平原河網地區(qū)水環(huán)境質量對土地利用結構的響應中文字幕在线更新资源站，以及水源水質對土地利用變化驅動力的響應。

And the equations are solved coupling iteratively whith PCG method for Laplace equation and Gauss—Seidel method for convective equation.So the distribution of piezometric tube waterhead and saturation can be obtained.And the seepace free surface will be captured automatically according to the distribution of saturation with the concept of VOF.

分別對飽和區(qū)的拉普拉斯方程采用預處理共軛梯度法A片、Com、非飽和區(qū)的對流方程采用Gauss—Seidel方法進行耦合迭代求解wwwav在线观看，得到滲流場的測壓管水頭分布和飽和度分布，并引入VOF的概念男生女生的www，由飽和度的分布自動撲捉滲流自由面黄免费视频。

The source of a river; headwaters; waterhead

你的那一套辦法對他來說沒用。

Results Meliorative group : 1 case （ 2.5%） died, and 2 cases （ 5.0%） occurred with obstructive waterhead.

結果改良組1例（2.5％）死亡全色A一级A片，2例（5.0％）發(fā)生梗阻性腦積水黄色国产区；傳統(tǒng)組5例（12.5％）死亡，6例（15.0％）發(fā)生梗阻性腦積水天天插天天狠天天透。

It has important effects for the stability of water conservancy building,the using of groundwater resource,the pollution controlling,the exploitation of rock oil and natural gas.And the needs of projects for those fields are increasing home and abroad.So the research of seepage flow becomes focuse.In this article,a saturated and unsaturated seepage model has been established which includes double variables:piezometric tube waterhead and saturation.

滲流現象是多孔介質中普遍客觀存在的運動規(guī)律国产精品初中视频，其對水工建筑物穩(wěn)定性、地下水資源利用一级a在线、污染控制免费污视频一区在线、石油天然氣開采等工程問題均具有重要的影響，隨著國內外在上述領域中工程需求的增加在线视频久，滲流研究日益成為熱點問題黄色电影你懂的。

waterhead：水位差

waterfall 瀑布 | waterhead 水位差 | water-holding capacity 持水量;持水能力

waterhead：水源

waterfront 水邊地碼頭區(qū) | waterhead 水源 | wateriness 潮濕

waterhead：水頭

waterhardening 水淬硬化 | waterhardness 水的硬度 | waterhead 水頭

waterhead：落差

waterhammer水去作 | waterhead落差 | waterjetarrester水注放電器

waterhead area：水源地

污染源pollution source | 水源地waterhead area | 地下水開采量amount of groundwater mining