ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

雨滴打擊對黃土坡面細(xì)溝侵蝕特征的影響
CSTR:
作者:
作者單位:

作者簡介:

通訊作者:

中圖分類號:

基金項目:

國家自然科學(xué)基金資助項目（41271299）和水利部公益性行業(yè)科研專項資助項目（201201083）


Effects of Raindrop Impact on Rill Erosion Characteristics on Loess Hillslope
Author:
Affiliation:

Fund Project:

  • 摘要
    • |
  • 圖/表
    • |
  • 訪問統(tǒng)計
    • |
  • 參考文獻(xiàn)
    • |
  • 相似文獻(xiàn)
    • |
  • 引證文獻(xiàn)
    • |
  • 資源附件
    • |
  • 文章評論
    摘要:

    基于模擬降雨試驗和紗網(wǎng)覆蓋消除雨滴打擊作用的試驗方法,，研究雨滴打擊對黃土坡面細(xì)溝侵蝕特征的影響,。試驗包括3種黃土高原代表性的侵蝕性降雨強(qiáng)度（50,、75、100 mm/h）和3個細(xì)溝侵蝕發(fā)生最常見的坡度（10°,、15°和20°）,。結(jié)果表明,，與有雨滴打擊試驗處理相比,，紗網(wǎng)覆蓋消除雨滴打擊后，坡面徑流穩(wěn)定產(chǎn)流率和含沙量均明顯減??；坡面侵蝕量和細(xì)溝侵蝕量分別減少28.1%~47.7%和20.2%~38.6%；而細(xì)溝侵蝕對坡面侵蝕的貢獻(xiàn)率增加,。消除雨滴打擊后,，坡度對細(xì)溝侵蝕的影響與有雨滴打擊時相同，而降雨強(qiáng)度對細(xì)溝侵蝕的影響增加,。有,、無雨滴打擊試驗處理的細(xì)溝密度和割裂度均隨著降雨強(qiáng)度和坡度的增加而增大；而細(xì)溝傾斜度的變化較為復(fù)雜,，所以細(xì)溝密度和割裂度可作為描述細(xì)溝形態(tài)的最佳指標(biāo),。試驗結(jié)果還表明，雨滴打擊對細(xì)溝溝槽形狀也有間接影響,，即消除雨滴打擊后,，細(xì)溝寬度和深度的變異程度減小,，溝槽形狀更為規(guī)則,。同時,，有雨滴打擊試驗處理的細(xì)溝寬深比隨著坡度和降雨強(qiáng)度的增加而減小，而無雨滴打擊試驗處理的細(xì)溝寬深比隨著坡度的增加而減小,，隨著降雨強(qiáng)度的增加呈微弱的增加趨勢,。

    Abstract:

    A rainfall simulation study was conducted to examine the effects of raindrop impact on rill erosion characteristics on the loess hillslope. The experimental treatments included three rainfall intensities (50, 75 and 100 mm/h) of representative erosive rainfalls on the Loess Plateau and three common slope gradients (10°, 15° and 20°) of rill erosion occurrence. Each experimental treatment included two surface treatments: with and without raindrop impact through placing the nylon net over the soil pan. The results showed that eliminating raindrop impact caused decreases in stable runoff rates and sediment concentrations; soil loss was induced and rill erosion was decreased by 28.1%~47.7% and 20.2%~38.6%, respectively; the increase in the contribution of rill erosion to hillslope soil erosion was induced. After eliminating raindrop impact, the effect of slope gradient on rill erosion was the same as that in treatments with raindrop impact; but the effect of rainfall intensity on rill erosion was increased. With regard to treatments with and without raindrop impact, both rill density and degree of rill dissection were increased with increase in rainfall intensity or slope gradient; but the changes of rill inclination angle were complex. Thus, rill density and degree of rill dissection were the optimal indicators to describe rill morphological characteristics. The results also indicated that raindrop impact had indirect influence on rill channel shape. That is, the degree of variation in rill width and rill depth was decreased, and rill channel shape was more inerratic after eliminating raindrop impact. With regard to treatments with raindrop impact, rill width-depth ratio was decreased with rainfall intensity or slope gradient increase. For treatments without raindrop impact, rill width-depth ratio was also decreased with increase in slope gradient, but it was slightly increased as rainfall intensity increased.

    參考文獻(xiàn)
    相似文獻(xiàn)
    引證文獻(xiàn)
引用本文

沈海鷗,鄭粉莉,溫磊磊,盧嘉,姜義亮.雨滴打擊對黃土坡面細(xì)溝侵蝕特征的影響[J].農(nóng)業(yè)機(jī)械學(xué)報,2015,46(8):104-112,89. Shen Haiou, Zheng Fenli, Wen Leilei, Lu Jia, Jiang Yiliang. Effects of Raindrop Impact on Rill Erosion Characteristics on Loess Hillslope[J]. Transactions of the Chinese Society for Agricultural Machinery,2015,46(8):104-112,89.

復(fù)制
分享
文章指標(biāo)
  • 點擊次數(shù):
  • 下載次數(shù):
  • HTML閱讀次數(shù):
  • 引用次數(shù):
歷史
  • 收稿日期:2014-10-09
  • 最后修改日期:
  • 錄用日期:
  • 在線發(fā)布日期: 2015-08-10
  • 出版日期:
文章二維碼