共查询到20条相似文献，搜索用时 78 毫秒
1.
提出一种基于球谐变换预测GERD水库蓄水过程中引起的地表形变的新方法。首先假定GERD水库分别在5 a、10 a、15 a间被注满,利用SRTM-DEM数据求取蓄水过程中每月水库的面积、体积和平均水高。经球谐展开后计算对应蓄水过程中引起的地表形变,并通过提高最大谐波度的上限来增加结果的精确度。3种蓄水策略下引起的垂向位移速率分别约为11.8 mm/a、5.9 mm/a、3.9 mm/a;引发的东向和西向位移速率分别约为1.8 mm/a和1.4 mm/a、0.9 mm/a和0.7 mm/a、0.6 mm/a和0.4 mm/a;引发的南向和北向位移速率分别约为2.6 mm/a和4.4 mm/a、1.3 mm/a和2.2 mm/a、0.8 mm/a和1.5 mm/a。 相似文献
2.
??????????????????????????????????????б????÷??????GNSS??????????飬?????????????????????????????????????????????????仯????????????????????????????????????3 mm??1 mm?????????????????????????????????2 mm??0.2 mm??????????仯?????????о???????????????????2?仯????????????????????????????仯????????峱??????????????????????????????????????????????????????????????????????????????????????????????????????????? 相似文献
3.
????????????????о??????????????????2003-2010??????????α?????????????????1??????????????α???????????????3?????????????????????????????????????????????α????????????Σ?2????????????жκ???ε????????????θ???????????????α????????4 mm/a??6 mm/a??????????Χ?????????????2 mm/a?????????????????????????￡?3???????????????3???????￡?????????????в???????????????α?????????????????????????????磬?鶴????????????????????????????0??4 mm/a?? 4??8 mm/a?????????????????????????????????????????????????α??????????????????????????????α????????4??8 mm/a??8??12 mm/a?? 相似文献
4.
LENGTH FREQUENCY ANALYSIS OF PLEURAGRAMMA ANTARCTICUM,ELECTRONA ANTARCTICA,PROTOMYCTOPHUM BOLINI 总被引：1，自引：0，他引：1
British Antarctic Survey(BAS)data collected near the Antarctic Peninsula area were used in this1988/1989 study on the length frequency of three Antarctic fish species(Pleuragramma antarcticum,Electrona antarctica and Protomyctophum bolini)showing that the standard length(SL)of P.Antarcticumranged from 26.0 mm to 161.0 mm,that the 26.0 mm to 54.0 mm SL juveniles could be considered tobe the age group 1 fish,and that the SL of E.antarctica ranged from 39.4 mm to 89.7 mm for themales and 48.0 mm to 118.0 mm for the females,which may contain at least 6 age groups.This ismore than previously thought.P.Bolini had 29.2 mm to 60.2 mm SL and complicated age com-position. 相似文献
5.
����GPS�����о���ɽ-���������˶�״̬ 总被引：1，自引：0，他引：1
???????????1999??2007???GPS?????????????????????????????????????????????β??λ????????????????????У?1999??2001???????????????????м??????????????????????????????????????????1.0 mm/a???????????????1.35 mm/a;2004??2007??????????????????????0.04??1.59 mm/a???????????????????????2001??2004??????????????????????????????3?????ξ?????????????????????????????0.7??1.55 mm/a?????????????????????????????1.0 mm/a?? 相似文献
6.
利用全球范围内224个IGS测站2019年的高精度对流层产品,对GPT3模型估计的天顶对流层延迟和大气水平梯度信息进行精度检验和分析。结果表明,精度在空间和时间分布上存在差异性,天顶对流层延迟、南北和东西方向大气水平梯度的平均偏差和均方根误差分别为0.12 mm/37.2 mm、-0.05 mm/0.49 mm、0.08 mm/0.57 mm。 相似文献
7.
收集陕西中南部1970年以来的多期精密水准测量数据，用基于GPS垂直运动速率约束的动态平差方法获得区域垂直运动速度场。分析表明，地壳垂直运动总体表现为山地、高原相对隆升，盆地相对下沉。相对于关中盆地，西部秦岭、陇山上升速率为4~5 mm/a，北秦岭造山带为2~3 mm/a，盆地北部的鄂尔多斯南缘为3~4 mm/a；相对于北秦岭，汉中盆地下沉速率为1.0 mm/a左右，安康等北大巴山裂谷下沉速率接近20 mm/a；秦岭北缘断裂垂直滑动速率为1.3~1.8 mm/a，华山山前断裂为2.0~2.8 mm/a，渭河断裂小于1.0 mm/a,渭河盆地北缘断裂为1.0~2.5 mm/a,南部断裂为0.7~1.1 mm/a。 相似文献
8.
YANGWanqin WANGKaiyun SeppoKellomaki XIAOLing 《山地科学学报》2004,1(2):166-174
The wet canopy evaporation rate (Er) was calculated by Penman-Monteith combination model based on three assumptions and with meteorological variables 2 m above the canopy in three stands, dominated by spruce (SF), fir (FF) and birch (BF) trees, respectively, in the subalpine forests in western Sichuan, China over a growing season. The total amount of the E was 44.5 mm for SF, 88.5 mm for FF and 57.8 mm for BF, accounting for 9.2%, 16.6% and 10.2% of the gross rainfall, respectively, in the measuring period. There was the highest average monthly Er and percentage of E to gross rainfall for FF compared with SF and BF.Mean Er was 0.097 mm h^-1 (ranging from 0.028 to0.487 mm h^-1), 0.242 mm h^-1 (from 0.068 to 0.711 mm h^-1) and 0.149 mm h^-1 (from 0.060 to 0.576 mm h^-1) for SF, FF and BF, respectively. The highest average monthly Er occurred in June was 0.120 mm h^-1 for SF, 0.317 mm h^-1for FF and 0.169 mm h^-1 for BF, and the lowest value in October was 0.083 mm h^-1 for SF, 0.187 mm h^-1 for FF and 0.101 mm h^-1 for BF, respectively. The averages of Er from 8:00 to16:00 were significantly higher than those from 0:00 to 8:00 and from 16:00 to 0:00 for the three stands. The marked daily and monthly differences of Er were contributable to the variations of solar radiation, air temperature and relative humidity above the canopy. 相似文献
9.
提出一种融合赫尔默特方差分量估计和径向基函数神经网络(HVCE-RBFNN)的三维形变计算方法,结合GNSS和InSAR监测数据,解算甘肃省金昌市金川西二采矿区的地表三维形变场。结果表明,基于HVCE-RBFNN方法获取的三维形变结果精度高于传统方法,其东西向、南北向和垂直向的均方根误差(RMSE)分别为20.85 mm、7.41 mm和34.47 mm,3个方向的最大形变量分别为228 mm、300 mm和193 mm,采空区形变空间分布符合开采沉陷规律。 相似文献
10.
熊思亦熊永良 《大地测量与地球动力学》2023,(9):899-903
为提高海平面变化预测精度,将自适应噪声完备集合经验模态分解(CEEMDAN)与长短期记忆网络(LSTM)相结合,采用“分解-预测-重组”思路,提出一种海平面变化预测组合方法CEEMDAN-LSTM。结果表明,相对于直接使用LSTM神经网络进行预测(MAE=16.87 mm, RMSE=21.51 mm),以及已有的EEMD-BP神经网络组合方法(MAE=10.4 mm, RMSE=15.44 mm),CEEMDAN-LSTM组合方法预测表现最优(MAE=8.89 mm, RMSE=11.34 mm),具有最低的预测误差。 相似文献
11.
渭河盆地GPS(1990~2015年)水平运动速率为4.3~11.6 mm/a，方向在107.8°E和110.5°E依次由西部的SEE转为中部的SE及东部的近E向。1980~2014年水准资料揭示，该地区垂向以继承性运动为主，速率-4.6~6.2 mm/a。鄂尔多斯地块以3 mm/a抬升，内部差异运动小于1 mm/a；盆地相对其以5 mm/a下沉，相对秦岭以4 mm/a下沉。垂向运动在凹陷和凸起区表现为四象限特征，断块/断裂交接处差异运动大、地震多发，西、南部断裂活动大于东、北部。岐山-马召等断裂以差异运动为主，渭河断裂中段达5 mm/a，其他断裂在3 mm/a以内。 相似文献
12.
????GPS????о????γ???????д???????????????????????????????????????????????????????????????????????????????????????????????????????????13.7??0.6??5.8??0.5??7.1??1.0??12.7??0.2??25.4??0.5 mm/a???????????Σ?????????????????????????????????????29.2??1.8??14.1??1.0 mm/a?????????????????????????????????????????18.5??1.0??15.2??0.6 mm/a?????????????????????????????10.7??1.1 mm/a????γ????д????????????????????????л?????? 相似文献
13.
基于 GRACE 重力卫星反演2002～2018年中国七大流域的水储量变化。研究表明,中国陆地水储量变化存在明显的地域分布特征,辽河、海河、黄河和淮河流域水储量总体上呈递减趋势,年均减少速率分别为-0.54±0.9 mm/a、-5.96±0.6 mm/a、-2.65±0.8 mm/a 和-1.94±1.2 mm/a。在海河流域,地下水严重超采导致水储量明显减少;松花江、长江、珠江流域水储量呈显著增加趋势,年均增长速率分别为4.52±1.1 mm/a、3.84±0.7 mm/a、4.87±1.1 mm/a。流域水储量峰值一般晚于最大降雨量月份,这是因为降雨转换为陆地水储量需要一定时间。 相似文献
14.
一、基本情况项目所在地为杜尔伯特蒙古族自治县一心乡，区域多年平均降雨量为400mm，6-9月降雨量占全年的23％。本县春季风大，光照强，升温快，蒸发量大。E20多年平均蒸发量1770mm；多年平均水面年蒸发量为1230mm，多年平均陆面蒸发量为360．0mm。相对湿度全年为60％。 相似文献
15.
��TOPEX/Poseidon���鳱վ�����ۺ�ƽ��仯 总被引：1，自引：0，他引：1
????TOPEX/Poseidon????????????鳱??????????1994~2000??????????????????????????仯???????????????????????????仯??????к?????????????T/P??????????????????????????????7.73 mm/a???????鳱?????????12.18 mm/a????????????????4.45 mm/a?????????????鳱?????????????????????????????????鳱???????????鳱???????????????????????????????鳱????????????????? 相似文献
16.
分析了2015年第173~175 d太阳活动对电离层以及地磁场的影响以及磁暴期间电离层延迟高阶项对观测值、静态PPP的影响。结果表明,受173 d爆发的日冕物质抛射和冕洞高速流的共同影响,174 d地磁持续扰动,达到大磁暴水平; L1、L2的二阶项延迟最大值分别达到20 mm、40 mm,三阶项延迟为2 mm、5 mm;电离层高阶项延迟对PPP的N方向的影响最为显著,最大值达到了7.1 mm,且呈向南偏移的趋势,对U、E方向影响的最大值可达4.6 mm,但没有一致偏移的规律。 相似文献
17.
????????CORS???ο????????????????????????????????????????????λ???й??????????????????????????CORS??????????????????????????????????????????????????????????????????????????????8.5 mm??????????????????????????????????????????????????????????????????????????PWV????????????????1.5 mm?? 相似文献
18.
���ÿ���-λ��ģ�ͷ��ݻ������������˶��Ͷ��ѻ 总被引：1，自引：0，他引：1
?????????1999??????GPS?????????д??????????GPS?????????????????????媲λ?????????????????????????????????????????????????????о???????????????壬?о????????????????????С????????????????????????????????????????????????????????????????????????1 mm/a?????κ???α????????????????????????40 km??30 km???????????????????????????????????????1 mm/a??????????????30 km????????????????????????????????1 mm/a?????????????????40 km?? 相似文献
19.
�ֽ�̫ԭ��������仯��ر���� 总被引：1，自引：0，他引：1
???????????????????????????????????????α??????????????????????α????????????????????????????????2001-2006?????????????21.8 mm/a?????????????????????????????????????????????Ч???2009??????????????????????????????????6.6 mm/a???????????????? 相似文献
20.
Studying the mechanical properties of the soil-root interface using the pullout test method 总被引：4，自引：0，他引：4
It is important to quantify the effect of the root diameter, the embedment length of the root and load speed on the soil-root interface mechanical properties for studying the root anchorage. The soilroot interface mechanical properties can be obtained through the pullout force and root slippage curve(F-S curve). About 120 Pinus tabulaeformis single roots whose diameters ranged from 1 mm to 10 mm divided into 6 groups based on different root embedment length(50 mm, 100 mm and 150 mm) and different load velocity(10 mm·min~(-1), 50 mm·min~(-1), 100 mm·min~(-1) and 300 mm·min~(-1)) were investigated using the pullout method. This study aims to explore the mechanical properties of the soil-root interface in the real conditions using the pullout test method. The results showed two kinds of pullout test failure modes during the experimental process: breakage failure and pullout failure. The results showed that the roots were easier to be broken when the root diameter was smaller or the loading speed was larger. The relationship between the maximum anchorage force and root diameter was linear and the linearly dependent coefficient(R~2) was larger than 0.85. The anchorage force increased with the root embedment length. An increase of 10%~(-1)5% for the maximumanchorage force was found when load speed increased from 10 to 300 mm.min~(-1). The mean peak slippage of the root was from 13.81 to 35.79 mm when the load velocity varied from 10 to 300 mm.min~(-1). The study will be helpful for the design of slopes reinforced by vegetation and in predicting risk of uprooting of trees, and will have practical benefits for understanding the mechanism of landslide. 相似文献