The shadows stray through burn and brae and dance in the sparkling rill.Tis night!

陰影通過燒傷和斜坡在閃耀的小溪迷路并且跳舞国产淫秽视频网站。

From west to east streams down the tumbling rill.

這翻滾的小河從西向東流去。

Or again, note the meanderings of some purling rill as it babbles on its way, tho' quarrelling with the stony obstacles, to the tumbling waters of Neptune's blue domain,'mid mossy banks, fanned by gentlest zephyrs, played on by the glorious sunlight or 'neath the shadows cast o'er its pensive bosom by the overarching leafage of the giants of the forest .

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Yet all the precedent is on my side: I know that winter death has never tried The earth but it has failed: the snow may heap In long storms an undrifted four feet deep As measured again maple, birch, and oak, It cannot check the peeper's silver croak; And I shall see the snow all go down hill In water of a slender April rill That flashes tail through last year's withered brake And dead weeds, like a disappearing snake.

《弗羅斯特詩精選》徐淳剛譯然而最新地址你懂的，所有的先例我都已經(jīng)過：我知道冬天的死亡想占領(lǐng)大地但終究失斢执笥执质悠怠：漫長的暴風(fēng)雪中雪能積到四五尺深www.91在线，風(fēng)吹不動當(dāng)它再一次壓住紅楓，白樺和橡樹欧美激情小视频，卻阻斷不了鳥們銀鈴般的歌聲国产精品国产一级国产AV；不久我將看到積雪全從山上滑落融入四月纖細的溪水中那閃光的尾巴穿過去年凋謝的花和枯死的草，像條消失的蛇hhzhh.com。

In the paper, we mostly studied the change of soil erosion process by a new REE tracer method, based on the theories of hydraulic mechanical subject and radionuclear tracer method, and simulated rainfall was applied to study the sheet erosion changing to rill erosion and the rill erosion process on slope land. The new REE tracer method should be useful to future studying of erosion processes on slope lands.1. Offering and testifying a new REE displacing method to study on the soil erosion of the loess slope.

本文以黃土坡面土壤侵蝕形態(tài)演變規(guī)律為研究重點98超碰日本人妻，以新的核素示蹤技術(shù)為手段，采用水動力學(xué)與核素示蹤技術(shù)相結(jié)合性色aⅴ免费网站、室內(nèi)人工模擬降雨與穩(wěn)定性REE元素示蹤相結(jié)合的方法毛片免费视频黄片A片免费，利用先進的INAA技術(shù)，定量研究了不同雨強次降雨條件下細溝間侵蝕向細溝侵蝕的轉(zhuǎn)變過程国产孕妇和黑人在线观看、細溝發(fā)生發(fā)育過程三日本三级少妇三级，為深入了解坡面侵蝕過程，建立黃土高原土壤侵蝕預(yù)報模型提供了研究基礎(chǔ)欧美激情第一欧美精品完整版。

The results indicate that the main erosion type is sheet ero-sion at the beginning of the rainfalls, and serious erosion happens after rill erosion appears. Accumulated sheet and rill erosion amount increases with the rainfalls time. The percentage of sheet erosion amount decreases and rill erosion percent-age increases with time. At the end of the rainfalls, the total rill erosion amounts are 4.3 and 5 times more than sheet ero-sion.

研究結(jié)果表明呻吟人妻一级无码AV，降雨初期坡面以面蝕為主，細溝出現(xiàn)后日韩福利一级视频在线播放网站免费，坡面侵蝕將加快加勅蘸夥迅咔逶谙呤悠怠；隨著降雨時間的延續(xù)亚洲黄色精品在线，累積面蝕量和細溝累積侵蝕量都將逐漸增加26uuu亚洲欧美另类，后者的增加速率大于前者，面蝕所占總侵蝕量的百分比隨降雨時間呈曲線形式逐漸遞減免费看黄色视频男操女视频网站，細溝侵蝕則逐漸增加男女插插视频；試驗結(jié)束時細溝侵蝕量分別為面蝕量的4—5倍。

Quantitatively studying on the change of accumulated sheet and rill erosion amounts.Sheet erosion rate firstly gradually increased, then rapidly increased and finally remained stable with the rainfalls time, but the rill erosion rate increased more quickly than sheet erosion rate and the value of rill erosion rate was higher than of sheet erosionrate.

定量分析了次降雨條件下累積面蝕量日韩精品导航视频在线播放网站、細溝累積侵蝕量及面蝕率欧美性爱久j草影院、細溝侵蝕率隨時間的變化在試驗條件下，隨著降雨的進行日韩性爱免费视频，坡面面蝕率先緩慢增加趨勢后基本保持穩(wěn)定色呦呦禁止网站，而細溝侵蝕率具有隨降雨時間急劇增加現(xiàn)象。

The soil erosion process on the slope was clearly divided into sheet erosion stage, rill erosion developing stage and rill erosion stable stage. Before lOminutes of rainfalls, the percentage of sheet erosion amount to total erosion amount was more than 90%, and it indicated that sheet erosion happened on the slope. This percentage sharply decreased before SOminutes of rainfall time, on the other hand, the percentage of rill erosion amount to total erosion amount increased in curve form with rainfall time.

在降雨前10min左右啊灬啊灬啊灬快灬高潮了在线观看，面蝕貢獻率約占坡面侵蝕總量的90%以上色哟哟伊人，為面蝕階段；隨著降雨時間的延續(xù)a色导航在线，面蝕貢獻率先急劇遞減最后在第30min左右基本達到穩(wěn)定啪啪啪免费试看，細溝侵蝕貢獻率則出現(xiàn)相反趨勢，此為細溝發(fā)育階段；降雨后期www.99riav29.com，面蝕和細溝侵蝕貢獻率的變化趨勢逐漸變緩且基本達到穩(wěn)定性欧美激情视频免费观看。

Besides, when the experimental soil was clay soil of Yangling, the appearance and developing process of rill erosion happened respectively 12-15min and 4-8min earlier than of silt soil of Shaanbei.Accumulated sheet and rill erosion amounts increased with the rainfalls time, and the latter increased quickly than the earlier. The total accumulated rill erosion amounts were 2.5 and 5.5 times more than accumulated sheet erosion amounts.

黃綿土坡面發(fā)生細溝侵蝕的時間早于粘黃土坡面12-15min；坡面細溝侵蝕達到穩(wěn)定的時間粘黃土坡面也比黃綿土坡面滯后約4-8min性爱a视频；累積面蝕量和細溝累積侵蝕量均隨降雨時間的延續(xù)而增加国产在一区二区线免费视频，且后者增加幅度明顯大于前者；降雨結(jié)束時人人操人人模人人看人人舔人人插，坡面細溝累積侵蝕量約為累積面蝕量的2.5～5.5倍国产又黄又粗又长网站，約占坡面總侵蝕量的80％以上。

Based on the result of field artificial rainfall experiments on 60m length slopes,sedi-ment delivery is consisted of raindrop impact,slope runoff and rill flow delivery.Accord-ing to their functions,rill was ranked firstly then slope run off,and last raindrop impact.

通過野外60m坡面人工降雨實驗及過程結(jié)果分析可知：輸移由雨滴擊濺人妻免费一区二区三区最新、坡面徑流和細溝輸移三部分組成人禽性直播，按作用大小來排，細溝流占第一位中国一级无码黄片，坡面徑流占第二位自拍偷拍欧美性爱视频，雨滴擊濺最小。