Results 21 to 30 of about 2,474 (175)
Analytical calculation of steady seepage in unsaturated layered soils [PDF]
The analytical calculations of unsaturated steady-state seepage in the widespread layered soils wewre relatively rare. Based on the Darcy seepage theorem and the continuity condition of soil layer interface, a mathematical model describing the steady ...
Dong QIAO, Nan WU, Peipei CHEN
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喀斯特高原石漠化区露石岩-土界面与非岩-土界面土壤入渗特性差异
Shuitu Baochi Xuebao, 2022 为揭示喀斯特石漠化区露石岩—土界面与非岩—土界面土壤渗透特性差异,通过环刀法探究岩—土界面与非岩—土界面土壤入渗特征及入渗模型适应性。结果表明:(1)岩—土界面0—10 cm土层和10—20 cm土层土壤容重大于非岩—土界面,土壤总孔隙度小于非岩—土界面。岩—土界面含水率和毛管孔隙度总体上大于非岩—土界面,非毛管孔隙度、黏粒和排水能力总体上小于非岩—土界面。(2)岩—土界面土壤的入渗能力总体上小于非岩—土界面,其初始入渗速率、平均入渗率、稳定入渗率小于非岩—土界面(平直形除外)。(3)3种形状岩 ...
许胜兵 +4 more
doaj
Benefit Evaluation of Different Allocation Modes of Soil and Water Conservation Measures in Ta-pieh Mountains Area [PDF]
[Objective] In order to reveal the effect of different soil and water conservation measures on reducing runoff and sediment in Ta-pieh Mountains, optimize the allocation mode of soil and water conservation measures in Ta-pieh Mountains.
JIA Tinghui +4 more
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Submarine fresh groundwater discharge estimation in the intertidal zone based on dynamic salinity simulation [PDF]
Currently, limited studies focused on the variations in submarine fresh groundwater discharge rates, seawater recirculation rates, and their respective proportions with tidal level change in sandy intertidal zones.
Chunlei LIU +5 more
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Shuitu Baochi Xuebao, 2022 为揭示退耕对石漠化区露石岩—土界面土壤渗透特性的影响,以典型石漠化坡耕地为对照,选择休闲地、退耕灌草和果园为研究对象,采用环刀法研究了平直、外凸和内凹型露石岩—土界面土壤渗透特性。结果表明:(1)不同退耕类型岩—土界面土壤入渗过程及特征差异较大,从初始入渗率到稳定入渗率衰减幅度在0.350~55.756 mm/min,而不同岩—土界面形状间土壤入渗速率差异较大;(2)不同退耕类型岩—土界面土壤入渗速率的主要影响因素为毛管孔隙度和非毛管孔隙度,初始入渗率、平均入渗率和稳定入渗率均与毛管孔隙度呈极显著负相关(
刘婷婷 +4 more
doaj
Soil Erosion Process Under the Combined Action of Water and Gravity on Red Soil Slope [PDF]
[Objective] Soil erosion is one of the most important ecological and environmental problems in the world. It is of great significance to reveal the coupling mechanism of water and gravity combined erosion by analyzing the water and sediment process of ...
MA Lan +4 more
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工程技术研究, 2019 文章结合精表处在陕西省山区高速公路养护工程中的应用，重点分析了精表处路面修复机理，介绍了精表处施工工艺，并对施工前后的路面表面功能进行了试验。结果表明，精表处能有效防止路面水渗入，路面抗滑性能得以恢复并能在一段时间内维持较高水准。同时，精表处固结了路面表面松散集料，改善了路表外观，提高了路面行驶质量。精表处技术施工后，路面性能可基本恢复至新修路面效果。精表处能有效改善道路的安全性能，从而减少交通事故的发生率，具有广阔的应用前景。
源 田
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Shuitu Baochi Xuebao, 2017 为了评价植被恢复对撂荒地土壤性状的影响，采用时空互代法，以黄土丘陵区不同年限撂荒地为研究对象，利用“环刀法”和原状土冲刷试验结合室内理化分析对其渗透性能和抗冲性进行了研究。结果表明，同一撂荒阶段，土壤初始入渗速率、稳定入渗速率、平均入渗速率和抗冲系数均随土壤深度的增加而下降；随着撂荒阶段延长，表层土壤初始入渗速率、稳定入渗速率、平均入渗速率和抗冲系数均为撂荒前期显著增大，后逐步趋于稳定，撂荒阶段间的差异显著大于土层深度的差异。在黄土丘陵区，利用Kostiakov模型回归参数a可有效表征初始入渗速率 ...
李 超, 周正朝, 朱冰冰, 覃 淼
doaj
Analysis of the rainfall threshold for post-fire debris flow initiation: A case study of the debris flow at Ren’eyong gully in Xiangcheng County, Sichuan Province [PDF]
In the early summer of 2014, a wildfire ravaged the Ren’eyong valley in the central Mt. Hengduan region of southwestern China. Following the blaze, debris flows were triggered three times in branch No. 3 due to short-term, low intensity rainfall.
Guisheng HU +4 more
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水电科技当前农业现代化快速推进，水资源管理加强，农田水利灌溉渠道的防渗保温防冻胀技术逐渐成为研究焦点。传统灌溉渠道常因长期使用而遭遇诸多问题，如水资源浪费、渠道渗漏以及冬季冻结，这些问题严重影响了灌溉效率和农业生产的稳定性。文章深入探讨了防渗、保温和防冻胀技术，旨在提升灌溉效率，节约水资源，确保农业生产的持续性，以提高农田灌溉的效率和可持续性，推动农业生产向更高效、环保的方向发展。
礼 周
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