坡面不同截-排水溝布置方式下土壤微團(tuán)聚體流失特征
發(fā)布時(shí)間：2019-06-03 16:52
【摘要】：傳統(tǒng)坡面水系工程主要在節(jié)約工程量的考量下,把截水溝布置成平行于等高線的形式,但為了符合坡面自然排水狀況,該研究中考慮用匯流和分流的方式來(lái)探究從理論上改變坡面溝道的基本形狀是否具有可行性。該研究設(shè)計(jì)按比例縮小的坡-溝模型,以無(wú)措施坡面為對(duì)照,用人工模擬降雨的方法探究在不同坡度、地類坡面上布置匯流型和分流型截排水溝道后,坡面土壤微團(tuán)聚體的流失變化規(guī)律。結(jié)果表明:在各個(gè)地類和坡度中,布置匯流和分流截排水措施后均出現(xiàn)較小顆粒微團(tuán)聚體(5μm)在侵蝕泥沙中富集的現(xiàn)象;在坡耕地中,布設(shè)截排水措施能顯著穩(wěn)定土壤小粒徑微團(tuán)聚體(5μm)比例的穩(wěn)定性,但分流截排水措施的效果更加明顯,但在5°和10°時(shí),匯流截排水措施能更好減緩坡面土壤粗化(250~1 000μm)趨勢(shì);匯流措施能減少林地侵蝕泥沙中微團(tuán)聚體富集的波動(dòng)性并控制林地坡面較小粒徑微團(tuán)聚體流失(5μm)的程度,但在荒草地中,總體來(lái)看,匯流措施對(duì)控制坡面微團(tuán)聚體流失具有更強(qiáng)的作用。匯流型和分流型截排水措施對(duì)不同地類坡面微團(tuán)聚體的控制保護(hù)各有側(cè)重,在布設(shè)坡面溝道時(shí),根據(jù)坡面、土壤實(shí)際情況和土壤保護(hù)要求來(lái)選擇坡面截排水措施是極有必要的。該研究為進(jìn)一步研究坡面自然排水方式在現(xiàn)實(shí)中運(yùn)用可能性和可行性提供部分基礎(chǔ)資料。
[Abstract]:Under the consideration of saving the amount of engineering, the traditional slope water system project arranges the cut-off ditch in a form parallel to the contours, but in order to meet the natural drainage conditions of the slope, In this study, confluence and shunt are considered to explore the feasibility of theoretically changing the basic shape of the slope channel. In this study, a slope-trench model with proportional reduction is designed, and the method of artificial rainfall simulation is used to explore the arrangement of confluence type and shunt cut-off drainage channel on different slope and land slope, compared with the non-measure slope, and the method of artificial simulation rainfall is used to explore the arrangement of confluence type and shunt cut-off drainage channel on different slope and land slope. The variation of microaggregates loss in slope soil. The results show that small particle microaggregates (5 渭 m) are enriched in eroded sediment after the arrangement of confluence and shunt drainage measures in each land type and slope. In sloping farmland, the distribution of cut-off drainage measures can significantly stabilize the stability of soil small particle size microaggregates (5 渭 m), but the effect of shunt cutting and drainage measures is more obvious, but at 5 擄and 10 擄, Confluence interception and drainage measures can better slow down the trend of soil coarsening (250 鈮，
本文編號(hào)：2492084
[Abstract]:Under the consideration of saving the amount of engineering, the traditional slope water system project arranges the cut-off ditch in a form parallel to the contours, but in order to meet the natural drainage conditions of the slope, In this study, confluence and shunt are considered to explore the feasibility of theoretically changing the basic shape of the slope channel. In this study, a slope-trench model with proportional reduction is designed, and the method of artificial rainfall simulation is used to explore the arrangement of confluence type and shunt cut-off drainage channel on different slope and land slope, compared with the non-measure slope, and the method of artificial simulation rainfall is used to explore the arrangement of confluence type and shunt cut-off drainage channel on different slope and land slope. The variation of microaggregates loss in slope soil. The results show that small particle microaggregates (5 渭 m) are enriched in eroded sediment after the arrangement of confluence and shunt drainage measures in each land type and slope. In sloping farmland, the distribution of cut-off drainage measures can significantly stabilize the stability of soil small particle size microaggregates (5 渭 m), but the effect of shunt cutting and drainage measures is more obvious, but at 5 擄and 10 擄, Confluence interception and drainage measures can better slow down the trend of soil coarsening (250 鈮，
本文編號(hào)：2492084
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