The tuen mun river is the major river of the tuen mun district , flowing southward from lam tei through a relatively narrow valley into tuen mun town centre and past the tuen mun typhoon shelter into the sea 屯门河是屯门区的主要河流，它从蓝地开始向南流，贯越狭小山谷进入屯门市中心，经屯门避风塘入海。
In the northern new territories , one of the critical flood mitigation undertakings is the shenzhen river regulation project , which is aimed at improving the downstream outlet for several major rivers in sheung shui and ta kwu ling 在新界北部，较重要的防洪工程包括治理深圳河计划? ?目的是提高位于上水及打鼓岭地区的主要河流出口的排洪能力。
The website features introduced the world ' s major rivers and the use of the status quo , international freshwater agreements and treaties , the us rivers and freshwater resources , freshwater conflict publications and references 描述:本网站介绍了世界主要河流特征和利用现状，国际淡水协议和条约，美国河流和淡水资源，淡水冲突的出版物和参考文献等。
Always been to collect the jade son s main river , and the famous jade river in the world with two great rivers of d . click draw keshen to be river ancient to call yuhe wu , county town black jade of bank of the river so as and gain the name promptly 和阗的两条大河历来是拾玉子的主要河流，是世界上有名的玉河。喀拉喀什河古称乌玉河，河边的县城墨玉即以此而得名。玉喀什河即古代著名的白玉河。
Meanwhile , the flood forecasting and warning center sunday said although the water started receding slowly in northern districts , padma river , one of the major rivers in the country , continued rising , deteriorating the flood situation in central region including capital dhaka and its adjacent districts 同时，洪灾预警中心周日说虽然北方地区的水势开始后退，但是这个国家的主要河流，巴拿马运河却继续上涨，中心地区包括达卡和它附近的地区水势继续恶化。
According to hydrochemistry monitoring material of northwest rivers in recent five years , and compared with the first northwest rivers water resources investigation appraisal result in 80 ’ s of last century , we analyzed the main rivers hydrochemistry condition , runoff degree of mineralization , total hardness and the hydrochemistry type distribution 根据近5a来对西北诸河的水化学监测资料，统计出了主要河流水化学状况；分析了河川径流矿化度、总硬度和水化学类型的地区分布，并与20世纪80年代第一次西北诸河水资源调查评价的结果进行了比较。
It is based on the above reasons , the leading system of flood , windstorm , drought control and the construction of water conservancy information engineering and the principle of theory and practicality are combined . based on the continuous development the following contents are researched in this paper : 1 . the flood occurred law on major rivers and flood problems and flood control measure 正是基于这种考虑，本论文结合广州市三防指挥系统工程和广州市水利信息化工程的建设，本着理论性与实用性相结合的原则，从可持续发展的角度，重点研究以下内容： 1 、广州市主要河流洪水发生的规律及存在问题与防洪措施； 2 、广州市现有防洪措施的防洪标准与可靠性； 3 、洪水预报与调度系统的方法与技术路线； 4 、现代防洪管理。
This paper studies the geochemistry and space distribution characteristics of mercury coming from soil by seating sampled from the land , river sides the parks in chengdu city and evaluates the pollution degree preliminary using the mercury coming from soil seating firstly 摘要首次将热释汞研究用于环境污染检测领域，对成都市市区，流经市区的主要河流沿岸以及市区内公园土壤中热释汞的地球化学特征及空间分布特征进行了分析研究，对热释汞的污染程度与其它汞的研究方法做了对比研究。
Normally water resources is affected by human activities and climatic change , but it is affected mainly by climatic change in runoff forming regions located in the high and middle mountainous area in the northwestern china . river runoff in the hexi inland arid region all originates from the qilian mt . area and the change of mountainous runoff resulted from global weather warming up and will bring an important effect to the development of society and economy in the hexi region . so the response on mountainous runoff and its changing trends are analyzed on the basis of the measured data of precipitation , air temperature , and discharges observed from some weather and hydrologic stations in the studied area . the results show that seasonal variation of mountainous runoff in the hexi inland region is mainly affected by the river ' s geographical location and supply source , and the yearly change by precipitation and that in the west of the region by air temperature besides precipitation . there are some obviously regional differences in the influences of climatic change on surface runoff in the hexi inland arid region , that is , rivers runoff in the west of the hexi area have been increasing and rivers in the east part have been decreasing , and the rivers runoff in the central part presented slowly increase trend , such as the heihe river , but it is not quite obvious 一般情况下,水资源的变化主要受气候变化和人类活动的影响,但在位于我国西北内陆干旱地区的中高山地带,径流的形成主要受前者的影响.甘肃省的河西内陆干旱区是该省重要的工农业生产和经济开发区,这里各项社会和经济活动与出山径流的变化都有着十分密切的关系.因此,笔者根据有关水文气象台站的降水、气温和径流观测资料,分析了以黑河、昌马河、西营河等主要河流为代表的河西内陆区出山径流的变化特征与规律.结果表明,河西内陆区出山口径流的季节变化主要受地理位置和河流补给来源的影响,而年际变幅则受山区降水量年际变化及变幅的影响十分明显.目前,梨园河以西河流水量处于上升阶段,梨园河以东的河流则处于下降的阶段;以黑河干流莺落峡水文站年径流为代表的走廊中部地区的出山口径流正处于1990年开始的枯水段的上升段.但总体而言,河西内陆干旱区出山口径流的变化相对比较稳定.预计今后若干年内,河西内陆干旱区东段河流出山口径流的变化以偏枯为主,中段、西段河流出山口径流的变化以平水或平水偏丰为主
Abstract : the restoration of the riparian vegetation disturbed by human activities is one of the hotspots of watershed ecology . through interpreting the images of remote sensing in 1985 and 1999 , the basic information of forest resources of lushuihe forest bureau , which is a typical forest area of changbai mountain , was obtained with support of gis . by dividing land covers of lushuihe area into 10 types ( water body , residential land , stump land , farming land , wetland , mature conifer forest , midlife conifer forest , mature broadleaf forest , midlife broadleaf forest , and man - made young forest ) and dividing the riparian zone into four buffers ( in turn , 1000 , 2000 , 3000 , 4000 m away from the river ) , the changes of riparian forest resources during 1985 - 1999 were analyzed . the results showed that the deforestation intension has obviously decreased and the whole environment has been evidently improved , but the riparian ecosystem was still flimsy . in buffer 1 , 2 , 3 , the area of midlife conifer forest increased largely , but the areas of other types of land covers all decreased . midlife conifer forest had a comparatively good status in the three buffers . in buffer 4 , midlife conifer forest , mature conifer forest , and mature broadleaf forest formed a forest - age rank that is helpful to stabilize the forest ecosystem and exert its functions . area percentage of wetland decreased in buffer 1 , buffer 2 , and buffer 3 , even in buffer 4 in which forest ecosystem rehabilitated comparatively well , so protecting and rehabilitating wetland is a very difficult task 文摘:本文对两期遥感图像进行解译,并在gis支持下提取露水河林业局主要河流两岸各缓冲区森林资源信息,经分析得到各类地物在1985年及1999年的变化趋势.结果表明:在河流沿岸对森林的采伐强度1999年较1985年明显减小,整体生态环境较1985年有所改善.在缓冲区1 , 2 , 3除中龄针叶林大幅度增加外,其它地物类型面积均减少,由此可以看出,在这三个缓冲区内针叶林得到了较好的恢复.在缓冲区4内,中龄针叶林、成熟针叶林、成熟阔叶林形成一个林龄梯队,有利于森林生态系统的稳定与功能的发挥,十五年间缓冲区4受到的干扰相对较小.湿地数量在四个缓冲区内均有所减少,虽然在缓冲区4内森林生态系统恢复的较好,但湿地面积仍有所减少,说明保护及恢复湿地资源是一件非常艰巨的任务,必须引起高度重视.图5表2参12
