And it has given the effects of the all factors on the runoff by 1D river networks mathematical model. Due to the natural and artificial influences, the water-sediment transport has greatly changed. It is characterized by marked decrease in runoff and sediment diverted from these outfalls and increase in water-sediment transport of main stream. The key factors causing these changes are aggradation of the three outfalls channels and Jingjiang river cutoff work.

結(jié)果表明，受自然因素和人為因素的影響日本wwwwwwwwww，荊江－洞庭湖江湖水沙輸移有了較大調(diào)整變化国产无码黄色网络，主要表現(xiàn)為三口分流分沙大幅度減小，干流水沙輸移增加中文字幕av有码高清片久久；江湖關(guān)系變化的主要因素是三口分流道的淤積萎縮和荊江裁彎日韩污视频。

It indicated that the annual runoff of the main and tributary of the Yarlung Zangbo river had an obvious decline trend during 1960s and reached the minimum in 1980s, since then, the annal runoff increased and a relatively wet season occurred in 1990s.

同時研究還發(fā)現(xiàn)www.毛片基地，雅魯藏布江干支流在20世紀60年代左右徑流量較大又粗又大又硬的黄片，但在進入60年代中后期之后，年徑流量呈逐漸減小的趨勢日韩无码av毛片，這種趨勢在80年代附近達到極小值婷婷五月天视频，此后徑流量逐漸回升，并在90年代后逐漸進入相對豐水期欧美日韩视频。

It was found that, for the control treatment the average runoff depth was 3.72mm per 10mm, the water loss index was 37.2%, the average soil erosion was 43.6 kg*hm-2*10mm-1, and the soil erosion modulus was 7.42 t*km-2*a-1, which are all high in the 4 treatments. For the other three treatments, the surface runoff and the average soil erosion amount were 2.20%-67.08%and 43.81%-90.83%lower than those of the control, respectively. The most effective pattern for soil conservation was the artificial forest with underbrush treatment, and the best water conservation pattern was the treatment of planting tea bush on contour terrace.

結(jié)果表明先锋资源二区，CK的平均徑流深度為3.72 mm/10 mm，降水流失率為37.2%黄片视频在线免费观看高清无码，平均每10mm降雨的土壤侵蝕量為43.6kg*hm-2观看黄A片免费AV网址，年土壤侵蝕模數(shù)為7.42 t*hm-2；其它3個不同植被覆蓋處理的地表徑流量比裸地對照降低2.20%～67.08%AV网站中文，平均土壤侵蝕量減少43.81%～90.83%久要色色；林下地表覆蓋處理的保土效果最好，等高梯田種植茶樹處理的保水效果最好日韩经典自拍电影院在线播放网站。

Wavy distribution of soil water along hillslope resulted from the fluctuation of runoff, upslope runoff infiltration, lateral downslope flow, and the difference of infiltration rate and evapotranspiration.

4土壤水分沿坡面呈"波浪形"分布是坡面徑流的波動性精品久久人人玩人人操、上方來水的沿程入滲、側(cè)向沿坡向下流以及坡面各處入滲性能和蒸發(fā)蒸騰作用的差異等綜合作用的結(jié)果欧美精品免费。

The result showed that hole shape and banding shape of soil preparation could significantly decrease runoff and soil erasion amount,and hole shape of soli preparation was the best to decrease runoff and soil rasion amount by 34% and 42% respectively.

結(jié)果表明美女黄的视频全免费一区二区，穴狀整地林和帶狀整地林對減少地表徑流和土壤侵蝕均具有明顯的作用，對減少營養(yǎng)元素的流失量作用顯著真正免费的毛片免费的毛片，年減少土壤養(yǎng)分流失量為79.75～135.40kg·hm－2·a－1蜜桃无码成人影片在线观看网站免费。

Based on the mentioned above ideas, it describes a method to determine the parameters involved in the hydrologic models when considering the effect of human activity on runoff. By the approach, the runoff is more clearly revealed. The concept of pattern unit hydrograph and its estimation method are presented.

基于上述思想，闡述了考慮人類活動影響的流域水文模型參數(shù)的確定方法香蕉视频A片，將人類活動影響納入流域水文模型參數(shù)的確定過程中去免费一级在线欧美视频网站，可以更深刻地了解流域水文的基本規(guī)律日本黄色网站大全，揭示人類活動對其徑流的影響。

Firstly, this paper studies the trend of the natural runoff of Huayuankou station, and then studies changing characteristic of runoff of Huayuankou station under the human activities. These human activities include runoff retention and use, growing industrial, agricultural and domestic water demands, water conservancy project and interlatitudinal water transfer project.

首先以花園口站為例性交BBW，分析其天然徑流的變化趨勢本页影院，然后從黃河流域徑流攔蓄及利用、工農(nóng)業(yè)及城鄉(xiāng)用水量的增加亚洲国产91精品、水利水保工程措施運用及流域調(diào)引水等因素中欧美性交播播，分析近年來人類活動的加強對花園口站徑流規(guī)律特性的影響及變化規(guī)律。

Statistical analysis shows that bulk density, saturated hydraulic conductivity, and dust on road surface have significant effects on runoff and soil loss. Stone cover may increase surface runoff, but vegetation cover is very effective in erosion control and runoff reduction.

土質(zhì)道路的容重和路面浮土與徑流系數(shù)和土壤流失量呈顯著正相關(guān)97超碰热线，飽和導(dǎo)水率則呈顯著負相關(guān)亚洲欧美制服中文字幕；路面雜草能顯著減少徑流，防治路面侵蝕黄色九九热视频。

By theory analyzing and example calculation and comparison, the conclusion is obtained that the traditional inferential method can be applied in the design flood peak flow calculation, yet it cannot truly express the runoff process of the rain drainage inlet, the instantaneous unit hydrograph depending on the real and actual datum is different to be used in the runoff discharge hydrograph calculation, and the no linearity reservoir means and the isochronal method have some physics base and its parameters easily evaluated and its runoff discharge hydrograph still more is close to practice.

5通過城市雨水地表匯流特性及計算方法的理論分析一本到东京、實例計算和對比得出：傳統(tǒng)推理法可應(yīng)用于城市設(shè)計洪峰流量的計算，但不能真實地反映雨水口徑流流量過程中文字幕一区二区久久综合；瞬時單位線法等對實測資料有較大依賴黄视频色网站，難以應(yīng)用于城市徑流流量過程線的計算；非線性水庫法和等流時線法的徑流流量過程線接近實際一级欧美一级日韩一级二级。

Compared with the exponent function, the power function can be more suitable for fitting the change of chemicals concentrations in runoff under unsaturated conditions from the loess slope,as well as,the mass loss of potassium and bromine in runoff,but not for initial phase. The study offered a reference for developing the model of soil nutrient in runoff transport of the loess slope.

同時利用兩種類型描述徑流養(yǎng)分濃度模型對實測資料進行分析性爱无码视频专区，結(jié)果顯示與指數(shù)函數(shù)模型相比較，采用冪函數(shù)模型能夠較好地模擬黃土坡面非飽和條件下徑流溶質(zhì)濃度變化過程欧美熟妇全黄A片，同時冪函數(shù)模型也能夠較好地描述徑流中鉀離子和溴離子的質(zhì)量變化過程看欧洲黄色视频，為進一步完善黃土坡面徑流養(yǎng)分遷移模擬模型提供了參考。