As an often used physical model with good theoretical and practical values, StreeterPhelps model has been widely used to study water quality. However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前進行河流水質(zhì)研究常用的物理模型超碰91欧美，具有良好的理論和實用價值国产永久在线视频，然而在某些特定水域裸体女人的视频一级A片，該模型的應(yīng)用受到限制久久不免费视频1，主要原因是復氧系數(shù)的取定多在水流速度較大情況下得到的久久久国产精免费视频，而未考慮水面波動對復氧系數(shù)的影響欧美另类A片在线播放，另外，在實際研究過程中發(fā)現(xiàn)三峽庫區(qū)COD變化的規(guī)律出現(xiàn)異常：在離排污口相當遠的水域欧美射射色，COD隨時間變化趨勢并不是指數(shù)衰減免费在线网站你懂得，而是在某個常值附近微小擺動，以往很多修正過的StreeterPhelps模型都無法解釋這個現(xiàn)象。

However, in some special water areas the utilitization of StreeterPhelps model has some limitation as confirming reaeration coefficient often comes from tests in rivers with fast water flow speed with no consideration of wave effects. Furthermore, in practical research in Three Gorges Reservoir, the changing rule of COD appears abnormally. In some water areas far from pollution source, the value of COD changes with time, but does not follow the exponential attenuation rule. This phenomenon can not be explained by former modified StreeterPhelps model.

StreeterPhelps模型是目前進行河流水質(zhì)研究常用的物理模型亚洲激情偷拍，具有良好的理論和實用價值涩涩涩亚洲日韩一区二区，然而在某些特定水域，該模型的應(yīng)用受到限制视频在线欧美视频在线看，主要原因是復氧系數(shù)的取定多在水流速度較大情況下得到的人人草公开操，而未考慮水面波動對復氧系數(shù)的影響，另外国内一级黄色a片，在實際研究過程中發(fā)現(xiàn)三峽庫區(qū)COD變化的規(guī)律出現(xiàn)異常：在離排污口相當遠的水域美女扒开腿让我爽视频软件网站，COD隨時間變化趨勢并不是指數(shù)衰減，而是在某個常值附近微小擺動久久伊人av无码毛片，以往很多修正過的StreeterPhelps模型都無法解釋這個現(xiàn)象欧美一级特黄大片色欧美精。

With the case study on Wanzhou in the three-gorges reservoir area, it had been studied and analyzed that the potentialities of exploitation and use on land and ecological safety by established land use database, and it had been revealed that serious loss of water and erosion of soil, ecological environment fragility, the water conservancy project submergence a large amount of land, arrannements of the numerous immigrations need a large amount of land, contradictory remarkableness among human and land, and the latent crisis by extensive management land were main crises and questions of the land use.

利用建立的土地利用現(xiàn)狀數(shù)據(jù)庫，以三峽庫區(qū)最大淹沒區(qū)萬州為研究對象影音先锋zyz，對庫區(qū)土地開發(fā)利用潛力及生態(tài)安全性進行了分析和研究www.zxdwt.com。揭示了庫區(qū)土地資源利用中存在的主要危機是水土流失嚴重、生態(tài)環(huán)境脆弱深夜A级毛片五月综合婷香久久，三峽工程淹沒土地多69欧美视频、移民遷建占地比重大、人地矛盾加劇及粗放經(jīng)營土地帶來的安全隱患等問題国产一区免费视频。

The study result has been used in Wanzhou stretch of the Three Gorges Reservior.

該研究的成果已在長江三峽庫區(qū)萬州段獲得了實際應(yīng)用视频一区图片一区另类。

At the center of the water debate is Three Gorges, China's largest and most visible reservoir.

中國水問題的中心話題正是三峽項目，它是中國最大也是最壯觀的水庫亚洲午夜精品视频。

Bermudagrass could be a promising species for revegetation of the water-level-fluctuation zone in the Three Gorges Reservoir Area.

從狗牙根對深淹脅迫的生理響應(yīng)上黄色视频在线播放网站，證明狗牙根是宜用于三峽水庫消落帶植被恢復的物種。

After five years, the Three Gorges Project is a very rich harvest of heritage preservation, very important.

這是一種稅的變種九一人人操人人摸，但又不是稅最新国产在线走光视频，比如說我們現(xiàn)在的電費4毛錢，現(xiàn)在加價4厘錢中文字幕精品一区二区日本。

The Three Gorges are the tracks of evolution with the river their propelling force. The riverboat is the human body and it's Man's will that strives to move upstream, against the current.

三峽代表了生命進化的軌跡A级片网站多少，河水則是動力，江船是人體国产免费一级小视频，而逆流上行的卻是人的意志又粗又爽又黄的吃奶视频。

Moreover, with the forthcoming sluicing of the reservoir of Three Gorges, such geological hazards in the reservoir area as landslide and rockfall are becoming more and more.

所以從社會減災防災意義上講，從社會屬性方面分析地質(zhì)災害具有更大的社會經(jīng)濟效益欧美激情在线。

Sand table model of the Three Gorges Project.

通過沙盤形象地介紹三峽工程的總體情況。