Combined a large number of on -site investigate and survey data of loess area in the north of Shaanxi Province, the paper analyzed the influence factors and interrelationship of slope erosion, then put forward the main influence factors , the peculiarity of outwash destructions the main style and protective measures about slope erosion of highway in loess area. The first: the emphasis about protective measures of cut-slope are the selection of rate of grade, the place of plain stage of slope, the slope protection; the second: the emphases about drainage of cut-slope is the rational installation and mating of drainage establishment; And following this principle: the effective holding up , the rapid obviating, the smooth articulation, the seepage prevention and prevent erosion.

根據(jù)陜北黃土地區(qū)公路的大量現(xiàn)場調查和實測資料一区二区欧美亚洲，分析了公路邊坡沖蝕的影響因素及其相互關系亚洲免费操，提出了黃土地區(qū)公路邊坡沖蝕的主要影響因素免费裸体黄网站在线观看、沖蝕破壞特點欧美一级鲁片一区二区三区、主要類型與防護對策超碰超碰超碰9在线巨乳，得出：199se在线播放、路塹邊坡坡面沖蝕防護重點是坡率選擇、邊坡平臺設置91大屁股合集、邊坡防護亚洲日韩欧美另类；2色综合无码视频、路塹邊坡排水重點是排水設施的合理設置與配套；并遵循有效攔截這一個毛片、迅速排除国产三级综合、銜接順暢、防滲防沖等原則深夜欧美日韩福利。

Soil erosion in the loess plateau, is great environmental problem at present, and soil erosion monitoring is of great significance for stipulateing the countermeasures against soil erosion.

在我國麻豆AV在线网站，黃土高原的土壤侵蝕是目前舉世矚目的環(huán)境問題，土壤侵蝕監(jiān)測對土壤侵蝕防治對策的制定具有重大意義男人的天堂一级片。

In this paper,soil erosion during the railroading engineering is analyzed in a systematic way;including the scope of duty on prevention of soil erosion, the topographic units, easy to be erided and the dynamic factors for soil erosion,etc.

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It showed the soil erosion was changing from sheet erosion to rill erosion.

表明坡面由片蝕為主逐漸過渡到片蝕向細溝侵蝕轉變的階段日韩精品娱乐在线观看网站免费。

In addition, with the progress of runoff scouring, the form of soil erosion changed from sheet erosion to rill erosion.

李勇等(1991)和李勇(1995)通過對黃土高原地區(qū)喬灌植被根系與土壤物理性質關系的研究，證

Based on the problems of the change of erosion types on the slope, we used a new REE tracer method, by placing different rare earth elements of different soil depth across a slope in an indoor plot, simulated rainfall and INAA were applied to study sheet erosion changing to rill erosion on slope land.

提出并建立了一種新的利用REE元素研究坡面土壤侵蝕的方法根據(jù)坡面不同侵蝕方式演變過程定量分析存在問題黄片69，提出并建立了人為沿坡面垂直分層布設不同的REE示蹤元素国产欧美亚洲另类第三十页，利用室內人工模擬降雨試驗和中子活化分析相結合的方法研究坡面侵蝕演變過程。

Soil erosion is widespread in the future should be strengthen the protection of grassland, afforestation, reduce the role of gully erosion and sheet erosion; should also note that the full utilization of water resources in the development of irrigated land, and substantial improvements in agricultural irrigation and drainage facilities to prevent flooding disasters.

水土流失現(xiàn)象普遍91夜色精品国产网站，今后應加強保護草坡国产激情视频久久久，植樹造林，減少溝蝕和片蝕作用国产精品一级毛片www；亦應注意水利資源的充分利用国产爆乳日韩精品视频迅雷下载，發(fā)展水澆地，并大力改善農田排灌設施亚洲色一区，防止水患災害AAA搡老熟女国产。

According to the result of artificial rainfall, the character and factors affectedby soil, rainfall, chemicals, slope length, slope gradient and field mangment practices, for rainfall, runoff,infiltration, soil erosion and soil chemicals, such as NO_3~-, NH_4~+, PO_4~(3-), K~+ and Br~-, are investigated. Thedeterminate methods, influence factors and practical application of the mixing zone depth are also researched.The results can enrich the dynamics of soil, water and nutrient transport, evaluate the soil water and fertilizerefficiency, and theoretically benefit the research of agricultural NSP on loess hill slope. 1. According to the surface transport experiments of soil chemicals under the non-satuation soil and watererosion condiction, for adsorbed PO_4~(3-) and K~+, the time of sheet erosion and rill erosion initiation is coincidentthat of chemicals content in surface runoff climbs, and then their abundant export by surface runoff is urged.

本文以黃土坡地為研究對象，通過模擬降雨試驗av在线免费资源，研究土壤因素国产激情自拍小视频、降雨因素、化學物質理化性質大又大又粗又黄三级少妇视频、坡長坡度因素和農田管理措施等對坡地降雨—產流—入滲—土壤侵蝕—農田NO_3~-国产在线b、NH_4~+、PO_4~(3-)无码啪啪网站、K~+和Br~-地表遷移的影響欧美色操，研究非飽和土壤和水蝕條件下混合層深度的確定、影響因素和模擬欧美一级作爱片，探討其在黃土坡地的實際應用日本亚洲国产精品麻豆www，為豐富坡地水分養(yǎng)分遷移動力學日韩无码视频二区、提高旱地土壤水分養(yǎng)分利用率和深化農田非點源污染研究提供理論依據(jù)。

By using the programs to process water depth data,the erosion and accumulation area can be found by drawing the contour diagram and stereogram about erosion and accumulation,and the corresponding erosion and accumulation weight and area sizes can also be calculated.

經程序處理后的水深數(shù)據(jù)欧美一级A片一级黑人，可以找出其沖淤區(qū)日韩欧美一级A片免费播放、繪制沖淤等值線圖和沖淤立體圖；計算出其沖淤量和沖淤面積亚洲中文字幕人成。

Based on observation data, the development process of the breach of landslide dams due to over topping may divided into 3 modes: vertical erosion, breadthwise extension and regression erosion of dam slope. A mathematical model describing the gradual failure process of the landslide dams is established based on the formula expressing the high intensity erosion obtained from experimental data, which can integrate the 3 modes of breach development process together. The validity of the model is verified by observation data.

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