共查询到19条相似文献，搜索用时 93 毫秒
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海南省GPRS水情测报系统完成了全省33个报汛站的水情信息自动采集、综合管理任务,实现了全省水雨情测报自动化,提高了报汛站数据采集传输处理的实时性和准确性.本文针对该系统实施中的设备选型、防雷保护措施和施工维护等方面的实际问题进行探讨,为系统运行和维护管理所参考. 相似文献
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本仪器适合高山、地区偏僻、雨量观測困难的測站和报汛站使用,能在室內观讀远距离的时段总雨量,报汛及时,精度为0.5或1.0毫米,并能减少劳动强度。因受精度及无自記过程装置等限制,故尚不能代替一般雨量站的雨量观測和自記雨量計的使用。 相似文献
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汛期中为了掌握水情预报及防汛需要,我会規定了各种不同的水位加报标准,要求各报汛站嚴格执行,为了防止因对加报标准不熟,而發生的漏报和迟报現象。今年汛期,高埸站想出一个繪圖示意的方法,可以保証加报水位的正确及时,特介紹出來,供其他报汛站参考。他們的办法是以水位和时間为縱横坐标,在 相似文献
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前言黄河报汛始于明朝后期,而宁夏青铜峡(峡口)报汛制度则建立于公元1709年。全面搜集、整理、考证报汛史料,分析推算洪水报涨尺寸相应的水他、洪峰流量,可大大延长青铜峡水文站现有洪水实测系列(1934年至今),对黄河上游水资源开发利用、水利工程规划设计具有重要的现实意义。 相似文献
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JDZ型固态存贮雨量器的特点是运行稳定可靠、记录数据准确,在雨量监测中发挥了很大作用。但不具备远程数据传输功能,无法实行自动化报汛。经过技术改造后,在原有功能不变的情况下,实现自动化报汛,产生了较好的经济效益和社会效益。 相似文献
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多坝水文站属一般站、报汛站、区域代表站。通过对多坝水文站1981-2012年实测年最大和年平均流量数据的分析,利用皮尔逊—Ⅲ型流量频率分布曲线来划分流量级,然后来划定不同的水位级,为本站不同量级时的流量测验制订切实可行的测验方案。可为抗旱防汛、防灾减灾奠定坚实基础。 相似文献
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Salinities occupied by different life stages of bay anchovy (Anchoa mitchilli) were compared over annual cycles at 128 stations in 12 Florida estuaries. The comparison included eight stations in an oligotrophic,
groundwater-based estuary in which all life stages were rare or absent. At other stations, adults, eggs, and early larvae
occurred in intermediate to high salinities (10-30 psu) with no apparent central salinity tendency. The larva-juvenile transition
was marked by an upstream shift to lower salinities (0-15 psu), also with no central salinity tendency. Mean salinities of
the juvenile catch were strongly dependent on the salinities of the sampling effort. This dependence was strongest in estuaries
that had weak horizontal salinity gradients. Weak salinity gradients were either natural or resulted from estuarine dams.
After using nonlinear regression to account for the interaction between effort salinity and catch salinity, catch salinities
were found to be similar from year to year within estuaries, but widely different among estuaries, with interestuarine differences
ranging as high as 10–13 psu. Lower salinities were occupied by juveniles in estuaries that had long freshwater turnover times.
Inherent geomorphic and inflow-related effects on the distribution of prey resources, coupled with an ontogenetic diet shift,
are proposed as the explanation for both the habitat shift and the strong interestuarine variability in salinity at capture. 相似文献
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Birgit H��nicke 《International Journal of Earth Sciences》2010,99(8):1721-1730
A statistical downscaling approach is applied to the output of five different global climate model simulations driven by twenty-first
century future scenarios of greenhouse gas concentrations. The contribution of sea-level pressure (SLP) and precipitation
changes to regional future winter sea-level changes is estimated for four Baltic sea-level stations by establishing statistical
relationships between sea level as predictand and large-scale climate fields as predictors. Using SLP as predictor for the
central and eastern Baltic Sea level stations, three climate models lead to statistically significant twenty-first century
future trends in the range of the order of 1–2 mm/year. Using precipitation as predictor for the stations in the southern
Baltic coast all five models lead to statistically significant trends with a range of the order of 0.4 mm/year. These numbers
are smaller, but of the order of magnitude as the predicted global sea-level rise. 相似文献
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青藏铁路无人值守地应力综合监测站 总被引：1，自引：1，他引：0
介绍了安装在青藏铁路沿线一种新型的无人值守综合地应力监测站。该监测站采用无线GPRS通信技术,通过Internet连接到安装在北京的地质力学研究所地应力监测局域网中心端服务器,实现数据交换和监测站的远程控制,该项技术克服了传统地应力测量需要人工现场信息采集的弱点,使用数据终端来实现地应力监测的自动化。该监测站能够进行青藏铁路沿线的昆仑山、安多、羊八井深孔应力监测和昆仑山西大滩昆中断裂位移监测,可以对青藏铁路沿线地球物理数据、地质灾害数据、地质环境数据及地球动力学过程实现不间断的监测,为青藏铁路沿线的地质灾害、青藏高原构造变形动力学过程的研究和地震预报、高原环境研究提供基础数据,增强了对青藏高原地质灾害、地震的预警能力。 相似文献
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M. Sachpazi A. Galv M. Laigle A. Hirn E. Sokos A. Serpetsidaki J.-M. Marthelot J.M. Pi Alperin B. Zelt B. Taylor 《Tectonophysics》2007,440(1-4):53-65
In this paper we expand over the whole of central Greece, the Moho map centered on the Gulf of Corinth from tomographic inversion of PmP traveltime profile data recorded by several tens of temporary stations. Our approach is based on Pn, Moho refracted waves, from a large regional earthquake recorded by both temporary stations and the permanent Hellenic network. The Moho map shows the large Moho depth under the Hellenides belt. It also highlights the shallower Moho domain towards the Aegean Sea south and east of the Corinth Gulf. The domain of shallow Moho is limited along a NE–SW prolongation ahead of the North Anatolian Fault, from the North Aegean Trough to the western tip of the Gulf of Corinth towards the Gulf of Patras. The Pn time-terms provide corrections for the permanent stations that can be used together with the 1D velocity–depth model for a first-order compensation of lateral heterogeneity and contribute to the accurate and fast location of earthquake hypocenters. As a test we relocated the 1995 Aigion earthquake in this way, using only the sparse data of the permanent stations. Hypocentral coordinates then shift close to those derived by a dedicated dense array deployed after the earthquake, implying improvement of the routine location. 相似文献
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The measurements of the parameters of split shear (S) waves from local deep-focus earthquakes recorded in 2005–2007 by a network of 12 seismic stations in Southern Sakhalin are
presented. The results revealed the heterogeneous distribution of the anisotropic properties beneath Southern Sakhalin. The
azimuths of the fast S-wave polarization beneath the stations in the central part of the peninsula are oriented along the NNW and NNE-NE directions
normal to and along the Kuril Trench. Beneath the stations located along the western and eastern coasts, the azimuths of the
fast S-wave polarization change their direction from NNW in the northern area to E-SE in the southern area. The highest anisotropy
degree (up to 0.9–1.5%) is recorded beneath the central part of Southern Sakhalin. The maximum values of the discrepancy in
the arrival time of the split S-waves are observed when the azimuth of the fast S-wave is oriented along the NNE beneath the active fault zones. The analysis of the variations of the S-wave lag time shows their weak depth dependence. The highest anisotropy is assumed in the upper layers of the medium (down
to a depth of about 250 km). The results obtained for the dominating wave frequency of 1–5 Hz represent mainly the medium-scale
anisotropy of the top of the studied region. 相似文献
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Recent decrease of water supply in central Asia and south Asia affects billions of people here. By filtering the errors at
higher frequency components and correcting for the contaminated components, we enhance the monthly GRACE gravity fields to
improve the determination of change in equivalent water height (EWH). The water storage changes from GRACE and the GLDAS hydrology
model all show decreasing trends in this region. At the annual and inter-annual time scales, significant correlations between
the variations in EWH and the variations in temperature, precipitation and snow equivalent height are found, especially at
high altitude stations, suggesting that climate change is the driving factor for the water depletion in central Asia and south
Asia. 相似文献
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Mohamed K.Salah 《地学前缘(英文版)》2012,3(5):681-696
Seismic anisotropy and its main features along the convergent boundary between Africa and Iberia are detected through the analysis of teleseismic shear-wave splitting.Waveform data generated by 95 teleseismic events recorded at 17 broadband stations deployed in the western Mediterranean region are used in the present study.Although the station coverage is not uniform in the Iberian Peninsula and northwest Africa,significant variations in the fast polarization directions and delay times are observed at stations located at different tectonic domains.Fast polarization directions are oriented predominantly NW-SE at most stations which are close to the plate boundary and in central Iberia;being consistent with the absolute plate motion in the region.In the northern part of the Iberian Peninsula,fast velocity directions are oriented nearly E—W;coincident with previous results.Few stations located slightly north of the plate boundary and to the southeast of Iberia show E—W to NE-SW fast velocity directions,which may be related to the Alpine Orogeny and the extension direction in Iberia.Delay times vary significantly between 0.2 and 1.9 s for individual measurements,reflecting a highly anisotropic structure beneath the recording stations.The relative motion between Africa and Iberia represents the main reason for the observed NW-SE orientations of the fast velocity directions.However,different causes of anisotropy have also to be considered to explain the wide range of the splitting pattern observed in the western Mediterranean region.Many geophysical observations such as the low Pn velocity,lower lithospheric Q values,higher heat flow and the presence of high conductive features support the mantle How in the western Mediterranean,which may contribute and even modify the splitting pattern beneath the studied region. 相似文献