Influence of slope width and length of fields on soil erosion

坡宽和田地长度对土壤侵蚀的影响

基本信息

批准号：
08660296
负责人：
KUSAKA Tatsuro
金额：
$ 1.54万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

项目摘要

Eroded particles from clay loan and sandy loan soil using two surface flows (25cm^3/s and 50cm^3/s) were investigated. The experimented soils were uniformly packed on a wooden erosion box of 80cm in length, 30cm in width and 5cm in depth to conduct the erosion experiment. Slope of the erosion box was 10ﾟ and the surface flow was provided for 10ﾟ minutes. Sediments were collected at every 2 minutes interval after runoff began and hence 5 samples from one experiment were collected for analysis. In particle analysis, sieves were used to separate the sand particles and paper filters were used to separate silt and clay particles. Clay particles were eroded in higher amount in the primary intervals in both soils with both surface flows. Sand was highest with highest erosion whereas silt did not show any remarkable effect. Sand and clay were increased and silt transportation decreased when surface flow increased. Eroded soil particles in every condition differs to those of the original. In clay loam soil, ratio of eroded silt and clay to the original was higher. Eroded sand ratio was only higher to the original in case of sandy loam soil with greater surface flow. Rills were developed over the soil surface when the ratio of the eroded sand to the original was with in the range of 0.64-0.72. Also fine particle, was found higher in the eroded soil than the original. Finally, selective erosion process of the mentioned soils and the unknown condition for nil formation during soil erosion concerned to the eroded particles was being clear from the study.

研究了使用两个表面流（25cm^3/s和50cm^3/s）从粘土贷款和沙质贷款土壤中侵蚀的颗粒。经过实验的土壤均匀地包装在80厘米长的木制侵蚀盒中，宽度为30厘米，深度为5厘米，以进行侵蚀实验。侵蚀盒的斜率为10℃，并提供了10°分钟的表面流。径流开始后每2分钟收集每2分钟，因此收集了一个从一个实验中收集5个样品进行分析。在颗粒分析中，使用筛子分离砂颗粒，并使用纸过滤器将粉砂和粘土颗粒分开。在两种表面流的两种土壤中，粘土颗粒的主要间隔较高量。沙子最高，侵蚀最高，而淤泥并未显示出任何显着作用。当表面流量增加时，沙子和粘土增加，淤泥转运减少。在各种情况下，侵蚀土壤颗粒与原始的土壤颗粒不同。在粘土壤土中，发射淤泥和粘土与原始的比率更高。在沙质壤土的表面流动更大的情况下，侵蚀的砂比仅与原始的砂比更高。当发射砂与原始的比率在0.64-0.72的范围内时，在土壤表面开发了rill。在发射的土壤中发现的细粒子也比原始土壤更高。最后，从研究中可以清楚地清楚提到的土壤的选择性侵蚀过程以及与侵蚀颗粒有关的土壤侵蚀期间未知的零形成条件。