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151.
152.
1989年,张俊峰发表了山东山旺盆地中新世(N2)2个蚂蚁新属新种:Heteromyrmex atopogaster Zhang,1989和Tolylasius inflatus Zhang,1989。经检验,前一个属是基于不实的观察结果,新属、种应予废除,作为未定属种归人蚁亚科(Formicinae);后一个属的建属根据都非建属的根据,其他的特征系毛蚁属(Lasius)的属征范围,没有建属条件,属应予废,保留其种,转移到毛蚁属。 相似文献
153.
Filip Lefebre Xavier Fettweis Hubert Gallée Jean-Pascal Van Ypersele Philippe Marbaix Wouter Greuell Pierluigi Calanca 《Climate Dynamics》2005,25(1):99-116
A simulation of the 1991 summer has been performed over south Greenland with a coupled atmosphere–snow regional climate model
(RCM) forced by the ECMWF re-analysis. The simulation is evaluated with in-situ coastal and ice-sheet atmospheric and glaciological
observations. Modelled air temperature, specific humidity, wind speed and radiative fluxes are in good agreement with the
available observations, although uncertainties in the radiative transfer scheme need further investigation to improve the
model’s performance. In the sub-surface snow-ice model, surface albedo is calculated from the simulated snow grain shape and
size, snow depth, meltwater accumulation, cloudiness and ice albedo. The use of snow metamorphism processes allows a realistic
modelling of the temporal variations in the surface albedo during both melting periods and accumulation events. Concerning
the surface albedo, the main finding is that an accurate albedo simulation during the melting season strongly depends on a
proper initialization of the surface conditions which mainly result from winter accumulation processes. Furthermore, in a
sensitivity experiment with a constant 0.8 albedo over the whole ice sheet, the average amount of melt decreased by more than
60%, which highlights the importance of a correctly simulated surface albedo. The use of this coupled atmosphere–snow RCM
offers new perspectives in the study of the Greenland surface mass balance due to the represented feedback between the surface
climate and the surface albedo, which is the most sensitive parameter in energy-balance-based ablation calculations. 相似文献
154.
目前国内外学者对嘧磺隆研究主要集中在其防除杂草的效果和用量方面,而对环境产生的生态效应研究仍然是一个空白。本文以某市用地下水灌溉蔬菜后相继出现受害事件展开调查,通过实地勘察农作物及其他野生植物的受害症状和特征,对污染区的潜水进行了全量分析,排除了地下水中无机物污染的可能。通过相关有机物的确认模拟试验,初步认定潜水遭受污染可能与嘧磺隆有关。在检测污染区及非污染区潜水中嘧磺隆含量和分析污染区地貌、水文地质条件的基础上,进行综合分析论证,得出了地下水确系嘧磺隆污染的符合实际情况的结论,为受害区农业生产污染防治提供了依据。 相似文献
155.
Installation of a vertical slurry wall around an Italian quarry lake: complications arising and simulation of the effects on groundwater flow 总被引:1,自引:0,他引:1
Slurry walls are non-structural barriers that are constructed underground to impede groundwater flow or manage groundwater
control problems. The study area is in the Piemonte plain (Italy), close to the River Po. Quarrying works carried out below
the piezometric surface created two big quarry lakes. The local groundwater system is characterized by a lower semi-confined
aquifer, which is overlain by a semi-permeable bed of clayey peat (aquitard) and an upper unconfined aquifer. Locally, the
peat fades away and the granulometry of this horizon becomes silty sandy. A planned enlargement of the quarry will increase
the size and depth of the quarry lakes. So the aquitard bed between the two aquifers will be damaged, creating a mixing rate
of groundwater. Such a procedure would not be compatible with the presence of two municipal wells upstream from the quarries.
Consequently, the installation of a vertical diaphragm (slurry wall) is recommended to separate the aquifers and to act as
a filter for the groundwater flowing from the unconfined to the semi-confined aquifer. To predict the consequences caused
by the installation of the vertical diaphragm separating the unconfined aquifer and the semi-confined one, a specifically
adjusted finite-difference model was used. The model showed a maximum rising of the water table equal to 12 cm, just upstream
of the diaphragm and for a distance of about 100 m, and a maximum lowering of 2 cm just downstream of the diaphragm. However,
the slurry wall would not cause any change in the piezometric head in the area where there are municipal wells and, hence,
will not have any negative effect on the functionality of the municipal wells. Moreover, the migration of water from the unconfined
aquifer through the vertical diaphragm will stimulate a series of attenuation and auto-depuration processes of eventual contaminants.
These processes are due to the higher crossing time that the groundwater flow takes to go through the vertical barrier (t
a = 96.5 days, whereas for the horizontal semi-permeable layer t
a = 9.6 days). So, the vertical diaphragm can be a resolutive element, representing a mediation and separation factor between
the unconfined and the semi-confined aquifers along the border of the quarrying areas, and a protective barrier for the water
quality of the quarry lake and the semi-confined aquifer. 相似文献
156.
A structural model for the seismicity of the Arudy (1980) epicentral area (Western Pyrenees, France)
Noalwenn Dubos-Sallée Bertrand Nivière Pierre Lacan Yves Hervouët 《Geophysical Journal International》2007,171(1):259-270
The Western Pyrenees presents a diffuse and moderate ( M ≤ 5.7) instrumental seismicity. It nevertheless historically suffered from strong earthquakes (I = IX MSK). The seismic sources of these events are not yet clearly identified. We focus on the Arudy (1980) epicentral area ( M = 5.1) and propose here the reactivation of early Cretaceous normal faults of the Iberian margin as a potential source. The late Cretaceous inversion of this basin, first in a left-lateral strike-slip mode and then in a more frontal convergence, resulted in a pop-up geometry. This flower structure attests of the presence of a deep crustal discontinuity.
The present-day geodynamic arrangement suggests that this accident is reactivated in a right lateral mode. This reactivation leads to a strain partitioning between the deep discontinuity that accommodates the lateral component of the motion and shallow thrusts, rooted on this discontinuity. These thrusts accommodate the shortening component of the strain. The distribution of the instrumental seismicity fits well the structural model of the Arudy basin. Whatever the compressive regional context, the structural behaviour of the system explains too the extensive stress tensor determined for the Arudy crisis if we interpret it in terms of strain ellipsoid. Indeed numerical modelling has shown that this concomitant activity of strike-slip and thrust faulting results in an extensive component that can rise 50 per cent of the finite strain.
We identify too a 25–30 km long potential seismic source for the Arudy area. The size of the structure and its potential reactivation in a strike-slip mode suggest that a maximum earthquake magnitude of ∼6.5 could be expected. The extrapolation of this model at the scale of the Western Pyrenees allows to propose other potential sources for major regional historical earthquakes. 相似文献
The present-day geodynamic arrangement suggests that this accident is reactivated in a right lateral mode. This reactivation leads to a strain partitioning between the deep discontinuity that accommodates the lateral component of the motion and shallow thrusts, rooted on this discontinuity. These thrusts accommodate the shortening component of the strain. The distribution of the instrumental seismicity fits well the structural model of the Arudy basin. Whatever the compressive regional context, the structural behaviour of the system explains too the extensive stress tensor determined for the Arudy crisis if we interpret it in terms of strain ellipsoid. Indeed numerical modelling has shown that this concomitant activity of strike-slip and thrust faulting results in an extensive component that can rise 50 per cent of the finite strain.
We identify too a 25–30 km long potential seismic source for the Arudy area. The size of the structure and its potential reactivation in a strike-slip mode suggest that a maximum earthquake magnitude of ∼6.5 could be expected. The extrapolation of this model at the scale of the Western Pyrenees allows to propose other potential sources for major regional historical earthquakes. 相似文献
157.
星载极化SAR数据模拟 总被引:5,自引:0,他引:5
介绍了自行开发的星载极化SAR数据计算机模拟系统,此系统采用的模拟方法遵循了星载极化SAR系统实际运行的情况,按发射脉冲时间序列,分别依次计算各发射脉冲相应的回波数据,与常用的以点目标为基础逐点模拟方法相比,计算效率高,现贴近实际系统,便于模拟各种误差的影响和保持其对所有目标回波影响的一致性和相关性。给出了星载极化SAR数据模拟的实例。 相似文献
158.
极化SAR干涉测量模拟研究 总被引:2,自引:0,他引:2
极化SAR干涉测量将极化测量技术和干涉测量技术巧妙地结合,能够提高干涉测量精度,尤其是在植被覆盖的情况下,不仅能够测量地表地形,而且使得估计植被高度成为可能。因此,近几年来国际上对极化SAR干涉测量技术的研究越来越重视,极化SAR干涉测量已成为SAR应用技术发展的重要方向。通过模拟技术深入研究极化SAR干涉测量理论和方法,并提出了一种新的极化SAR干涉测量改进算法,模拟实验结果表明,该算法可以进一步提高测量精度。 相似文献
159.
淄博市大武水源地地下水水位总体预测 总被引:1,自引:0,他引:1
本文采用水均衡法对淄博市大武水源地地下水位变动进行研究,并对降水量与人渗补给量的关系以及平均给水度随地下水位的变化关系进行了分析。通过历史资料的验证,表明本文所建立的水均衡模型对于地下水位变动的预测是可靠的,而且简单可行,随后根据不同的地下水开采量等对未来地下水位的变动趋势进行了预测。 相似文献
160.