In recent years, extreme rainfall events occur frequently, causing serious watershed sediment disasters, destroying mountain roads, and endangering the safety of residents' lives and property. This study aims to deal with the spatial change of potential sediment movement on the road slope pre-disaster and to screen disaster hot spots for early warning and control system. The conceptual model is used to simulate the distribution of primary and/or derived disasters on a watershed scale to assess the impact of sediment disasters caused by heavy rain event. Correlation analysis shows that the models in assessment of primary disaster and derived disaster are significantly correlated with the collapse ratio and disaster ratio, respectively. Since the primary disaster has been considered when calculating the derived disaster risk, the terrain subdivision along Provincial Highway 21 (Tai-21) is extracted to understand the derived sediment disaster on the road slope. The model can effectively evaluate the road sections prone to disasters. According to the risk level, the hot spot of road slope disasters and the management of disaster resilience are determined and can be the reference for disaster prevention and control.
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Bao-Ping Gan Jiang-Feng Qin Ren-Zhi Zhu Shao-Wei Zhao Tong Li 《International Geology Review》2017,59(3):311-332
Voluminous Neoproterozoic mafic–ultramafic, felsic, and alkaline intrusions are found in the northern Yangtze Block, South China. Here, we present whole-rock major and trace element, and Sr–Nd isotopic compositions, together with zircon U–Pb ages, for syenite and gabbro samples from the Shuimo–Zhongziyuan alkaline intrusive complex in the Micang Mountains region at the northwestern margin of the Yangtze Block. Zircon U–Pb dating yields crystallization ages for the Na- and K-rich Shuimo syenites of 869 ± 4 (MSWD = 0.85, 2σ) and 860 ± 5 Ma (MSWD = 0.47, 2σ), respectively, and for the Zhongziyuan gabbros of 753 ± 4 Ma (MSWD = 0.23, 2σ), indicating that the syenites and gabbros represent different stages of magmatism. The syenites include both Na- and K-rich types and have high values of the Rittman index (σ), and high SiO2 and Na2O + K2O contents. These syenites are enriched in light rare earth elements (LREE) and large-ion lithophile elements (LILE), but depleted in high-field-strength elements (HFSE), with high (La/Yb)N values and small negative and positive Eu anomalies (Eu/Eu* = 0.74–1.17). In contrast, the gabbros have lower SiO2 and Na2O + K2O contents, are only slightly enriched in LREEs, are enriched in LILE but depleted in HFSEs, and have small negative and positive Eu anomalies (Eu/Eu* = 0.86–1.37). The syenites have low initial 87Sr/86Sr (0.703340) and ?Nd(t) values (+1.9 to +7.7). The gabbros have relatively high initial 87Sr/86Sr (0.703562–0.704933) and positive ?Nd(t) values (+1.6 to +4.5). These data suggest that the syenites and gabbros are isotopically similar and were largely derived from melts of depleted mantle. The syenites underwent significant fractional crystallization and small amounts of crustal contamination during magma evolution. In contrast, the gabbros were formed by partial melting (>15%) of a garnet lherzolite source and might also have experienced crustal assimilation. Taking into account the geochemical signatures and magmatic events, we propose that the Shuimo syenites formed in an intra-arc rifting setting, however, the Zhongziyuan gabbros were most likely produced in a subduction-related, continental margin arc setting during the Neoproterozoic, thus suggesting that the alkaline intrusive complex were formed by the arc-related magmatism in the Micang Mountains. 相似文献
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作为典型的降河洄游鱼类,花鳗鲡(Anguilla marmorata)在我国主要分布于长江下游及以南水域。中草药作为抗生素等化学类渔药的绿色替代品,对养殖鱼类具有抗菌、消炎、促生长等多种功效。为研究中草药复方在花鳗鲡病害防治中的作用,扩大水产养殖业渔药研制与应用的选择,采用非连续性密度梯度离心法对花鳗鲡外周血白细胞的分离体系进行了优化,试验设置了密度分别为1.031、1.043、1.056、1.067、1.090 g/mL的五种分离液,分别采用染色观察法和流式细胞术检测各分离液中白细胞浓度;以浓度1.0mg/mL的五种复方药液分别与105cell/mL的白细胞悬液共孵育2h后,分别采用NBT法和流式细胞术测定白细胞的呼吸暴发活性和吞噬能力,评价五种中草药复方(多糖复方Dt,白头翁复方Btw,板蓝根复方Blg,大黄复方Dh,百里酚复方Blf)对花鳗鲡外周血白细胞的激活作用。结果显示:1.043g/mL和1.056g/mL的分离液所分离获得白细胞浓度均接近105cell/mL,可在后续实验中叠加使用该两个浓度的分离液分离获得白细胞;流式细胞术检测白细胞浓度比染色观察法更为灵敏准确;5种复方均能显著提高花鳗鲡外周血白细胞的呼吸暴发活性(P<0.05),大小依次为Blg>Dt>Btw>Blf>Dh;Dt和Blg能显著提高白细胞吞噬率(P<0.05),Btw、Blf、Dh也能提高白细胞吞噬率,但差异不显著(P>0.05);5种复方对发生吞噬白细胞比率的影响差异不显著(P>0.05)。 相似文献
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Lin Chao-Yuan Lai Yuan-Chung Wu Shao-Wei Mo Fan-Chung Lin Cheng-Yu 《Natural Hazards》2022,111(2):1951-1975
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Lin Chao-Yuan Shieh Pei-Ying Wu Shao-Wei Wang Po-Cheng Chen Yung-Chau 《Natural Hazards》2022,113(1):287-313
Natural Hazards - Wildfire is a common disaster in the world, and it has a considerable impact on the safety of residents and ecological disturbance. Periodic wildfires are an urgent problem to be... 相似文献
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设计1套倾角测量装置,用以配合海底原位设备对深海环境探测。分析常规的低成本倾角测量方式的原理及存在的不足,提出采用差动输入运算放大器对传感器数据进行预处理、提高后期倾角分辨率的方案。实验证明,这种方案能够扩大输出量程、提高倾角分辨率。在全角度范围内,分辨率在(0.18(°),0.5(°))区间变化,能够满足海底观测站对高精度倾角测量的要求。 相似文献
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氧化应激是饲料组胺胁迫对鱼体产生危害的主要途径之一。研究具有强抗氧化能力的虾青素对美洲鳗鲡幼鱼饲料组胺胁迫的缓解效果, 对降低鱼类饲料源胁迫具有重要意义。将400尾初始体重为(25.01±0.17) g/尾的试验鱼随机分为4个处理组, 即对照组、H组、H+Ast4组和H+Ast8组, 分别饲喂基础饲料、高组胺饲料(662 mg/kg)及在高组胺饲料中添加4 mg/kg、8 mg/kg虾青素的试验饲料。结果显示: 与对照组相比, H组美洲鳗鲡幼鱼生长性能和血清非特异性免疫能力显著降低(P<0.05),肠道自由基水平显著升高(P<0.05),肠道有害菌群丰度升高; H+Ast组美洲鳗鲡幼鱼的生长性能、血清非特异性免疫能力显著高于H组(P<0.05),肠道自由基水平显著低于H组(P<0.05), 上述指标H+Ast组与对照组无显著差异(P>0.05)。H+Ast组肠道有益菌群丰度高于H组和对照组。可见, 添加4 mg/kg虾青素即可缓解饲料组胺胁迫导致的美洲鳗鲡幼鱼生长抑制, 提高血清非特异性免疫能力, 降低肠道自由基水平, 有益调节肠道菌群。添加8 mg/kg虾青素对美洲鳗鲡幼鱼上述指标无进一步的改善效果。研究结果可为虾青素缓解美洲鳗鲡饲料组胺胁迫及其在饲料中的推广应用提供参考。 相似文献
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