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排序方式: 共有723条查询结果,搜索用时 15 毫秒
1.
调查了潜蝇在湛江市的发生与为害情况,结果表明,美洲斑潜蝇(LiriomyzaSatiuaeBlanchard)是为害作物潜蝇的优势种,包括有6个科18种,年间发生有6个为害高峰期。应用绿潜宝、乐果、巴丹等药剂在发生为害高峰期的峰前、中、后三次用药,防治效果维持70%以上。 相似文献
2.
Glacier change and glacier runoff variation in the Tuotuo River basin,the source region of Yangtze River in western China 总被引:3,自引:0,他引:3
Glaciers in the Tuotuo River basin, western China, have been monitored in recent decades by applying topographical maps and
high-resolution satellite images. Results indicate that most of glaciers in the Tuotuo River basin have retreated in the period
from 1968/1971 to 2001/2002, and their shrinkage area is 3.2% of the total area in the late 1960s. To assess the influence
of glacier runoff on river runoff, a modified degree–day model including potential clear-sky direct solar radiation has been
applied to the glaciated regions of the river basin over the period 1961–2004. It was found that glacier runoff has increased
in the last 44 years, especially in the 1990s when a two-thirds increase in river runoff was derived from the increase in
glacier runoff caused by loss of ice mass in the entire Tuotuo River basin. 相似文献
3.
S. T. G. Raghukanth 《Natural Hazards》2008,46(1):1-13
In this article, analytical methods have been used to estimate ground motion during the 8 October 2005, Kashmir earthquake.
Peak ground acceleration (PGA) values at several stations in the epicentral region have been estimated by empirical analytical
source mechanism models. As an alternate analysis, PGA estimates have also been obtained using the stochastic finite fault
seismological model. The estimated PGAs are compared with that obtained from damage values. A PGA contour map in the near-source
region is provided. It is found that very near to the epicenter, PGA would have reached more than 1 g. It is demonstrated
that empirical analytical models can be effectively used to estimate ground motion due to rupture of active faults. 相似文献
4.
天山奎屯河哈希勒根51号冰川表面运动特征分析 总被引:14,自引:14,他引:14
奎屯河哈希勒根51号冰川位于新疆奎屯市以南的天山依连哈比尔尕山北坡, 奎屯河上游支沟哈希勒根河源区. 1999年8月, 在该冰川上布设了用于冰川运动和冰川物质平衡观测研究的测杆18根, 并进行了冰川表面运动、冰川物质平衡和冰川末端变化的首次观测. 根据2000年8月和2001年8月的冰川运动观测资料, 分析了奎屯河哈希勒根51号冰川的运动特征和冰舌末端的变化状况. 结果表明: 奎屯河51号冰川应属于亚大陆型冰川; 1999/2000年度和2000/2001年度的表面运动值不大, 最大流速点的年运动速度为3.15 ma-1; 运动速度垂直分量UZ的变化规律同乌鲁木齐河源1号冰川的变化规律相同, 即消融区的显出流作用和积累区的显入流作用. 该冰川的冰舌末端处于相对稳定的退缩状态, 1964-1999年间平均退缩量约为1.4 m*a-1, 而1999-2001年间的平均退缩量为5.0 m*a-1, 反映出冰川退缩增大的趋势. 相似文献
5.
6.
Neotectonic Control on the Geomorphic Evolution of the Gangotri Glacier Valley, Garhwal Himalaya 总被引:1,自引:0,他引:1
The paper records evidences of neotectonic activities in the Gangotri glacier valley that are found to be responsible for the present-day geomorphic set-up of the area since the last phase of major glaciation. Geomorphological features indicate the presence of a large glacier in the valley in the geological past. Prominent planar structures present in the rocks were later on modified into sets of normal faults in the present-day Himalayan tectonic set-up giving rise to graben structures. The block nearest the snout is traversed by the NW-SE trending Gaumukh fault. A number of terraces mark the entrenchment of Bhagirathi River in this part. The contrasting drainage morphometric parameters of two sides of the valley and asymmetric recessional patterns of the tributary glaciers further document movement along the fault. The distribution and orientation of debris fans also seem to be controlled by neotectonic activity. The neotectonic activity that followed the process of deglaciation has brought the glacially carved, wide U- shaped valley in contact with the present-day fluvially incised narrow and relatively deep valley. The wider segments have become sites of active deposition of glacially eroded debris. The low gradient and excessive filling has resulted in the river attaining a braided nature in these segments. 相似文献
7.
Application of dendrochronology and geomorphology to a recently emerged coastal area near Juneau, Alaska, has documented a Little Ice Age (LIA) sea-level transgression to 6.2 m above current sea level. The rise in relative sea level is attributed to regional subsidence and appears to have stabilized by the mid 16th century, based on a sea-cliff eroded into late-Pleistocene glaciomarine sediments. Land began emerging between A.D. 1770 and 1790, coincident with retreat of regional glaciers from their LIA maximums. This emergence has continued since then, paralleling regional glacier retreat. Total Juneau uplift since the late 18th century is estimated to be 3.2 m. The rate of downward colonization of newly emergent coastline by Sitka spruce during the 20th century closely parallels the rate of sea-level fall documented by analysis of local tide-gauge records (1.3 cm/yr). Regional and Glacier Bay LIA loading and unloading are inferred to be the primary mechanisms driving subsidence and uplift in the Juneau area. Climate change rather then regional tectonics has forced relative sea-level change over the last several hundred years. 相似文献
8.
黔西南高原区峰丛洼地的形态特征与发育规律 总被引:2,自引:0,他引:2
本文通过对黔西南坡岗地区峰丛洼地形态参数的统计和趋势面分析,论证了高原区峰丛洼地的形态特征与发育,探讨了高原区暗河纵剖面形态和喀斯特地貌演化的规律。 相似文献
9.
唐古拉山冬克玛底冰川雪层中淋溶作用的初步研究 总被引:7,自引:7,他引:7
利用唐古拉山冬克玛底冰川雪坑和表层积雪样品的实测资料,初步探讨本区雪层中离子淋溶作用的特征,影响因素及其对冰芯记录的干扰。研究发现淋溶作用能够对数周至数月时间尺度的雪层记录产生“平滑”作用,但不会影响冰芯记录的长期变化趋势。 相似文献
10.
对乌鲁木齐河源1号冰川积累区一支深达91.64m的透底冰芯进行了详细的层位及冰结构分析,结果表明,在20m深度以内,很好地保存了原始沉积的特征,但在70 ̄80m深处还发现小密度的乳白色冰占优势的冰层,可能形成于小冰期,中层具有动力变质及再结晶作用共存及反复消长的结构特征(冰晶尺寸、气泡),未见单极大型组构,但出现弱竖环形组构,底层出现弱宝石状的多极大组构。 相似文献