نتایج جستجو برای: karst

تعداد نتایج: 4636  

Journal: :Croatian medical journal 2008
Tatjana Bakran-Petricioli Donat Petricioli

of the Dalmatian coast type, formed primarily from karst limestone, Eastern Adriatic coast shows great diversity of habitats. This diversity is also influenced by the position of the Adriatic Basin, stretching from northwest to southeast, climatic differences along its length, and the direction of sea currents. Habitats in the submerged karst characteristic for the Croatian side of the Adriatic...

1970
Levent Tezcan Mehmet Ekmekci

Karst is a hydrogeological environment of importance not only for its water resources potential but also for its scenic and economic potential, thereby increasing the intensity of human impact. The uniqueness of karst in this regard stems from its high sensitivity and vulnerability to imposed pressures and its distinctive response to these pressures. Therefore, a clear definition and formulatio...

1999
OGNJEN BONACCI

Karst hydrological investigation of the sinking stream problem of the River Zrmanja is presented. The aim of this analysis is to assess the feasibility of constructing three hydroelectric power plants (HEPP) along the River Zrmanja course. This paper presents a suitable and simple hydrological methodology that can be applied to scarce available data obtained on complex karst terranes. The paper...

2009
Anthony H. Cooper

Gypsum karst problems in the Permian and Triassic sequences of England have caused difficult conditions for bridge and road construction. In Northern England, the Ripon Bypass crosses Permian strata affected by active gypsum karst and severe subsidence problems. Here, the initial borehole site investigation for the road was supplemented by resistivity tomography studies. The roadway was reinfor...

2016
Lan-Ping Zheng Xiao-Yong Chen Jun-Xing Yang

The major phylogenetic pattern of the cyprinid tribe Labeonini has been revealed by previous molecular studies; however, the relationships within a clade that mainly inhabits the karst regions, which we refer to as the "karst group", in southwest China remain unresolved due to the low taxon sampling. This group includes more than 50% of the genera and species of Labeonini in China. Moreover, mo...

Journal: :World journal of microbiology & biotechnology 2012
Xiangbi Chen Yirong Su Xunyang He Yawei Wei Wenxue Wei Jinshui Wu

Soil microorganisms play vital roles in recovering and maintaining the health of ecosystems, particularly in fragile Karst ecosystems that are easily degraded after cultivation. We investigated the composition and diversity of soil bacterial communities, based on RFLP and 16S rDNA sequencing, in a cropland, a naturally revegetated land with former cultivation disturbance and a primeval forest i...

2009
Yonghong Hao Yuen Zhu Ying Zhao Wei Wang Xin Du Tian-Chyi J. Yeh

One of the largest karst springs in North China, the Jinci Springs, dried up and has remained dry since 1994. We develop a correlation analysis with time-lag and a regression analysis with time-lag to study the relation between spring flow and precipitation. This allows us to obtain a better understanding of karst hydrological processes by differentiating the contribution of variation in precip...

Journal: :Remote Sensing 2014
Hongyan Cai Xiaohuan Yang Kejing Wang Linlin Xiao

The Southwest China Karst, the largest continuous karst zone in the world, has suffered serious rock desertification due to the large population pressure in the area. Recent trend analyses have indicated general greening trends in this region. The region has experienced mild climate change, and yet significant land use changes, such as afforestation and reforestation. In addition, out-migration...

حاجی کریمی ذبیح‌الله چهارراهی فرشاد صفری مهران مقصودی,

Massif of Parav-Bistoun covered around 880 square kilometers of the thrust zone of Zagros Mountains and located in Kermanshah province. There are various kinds of karst Landforms such as jamas, uvulas', dolines, caves in this mountainous area. These landforms are under the influence of palaeoclimatic conditions. Nowadays, current climatic conditions in this area allows for development of karst ...

2002
R. Nan B. Peng Y. Qiu G. Ren S. Wu Y. Zheng W. Zhu C. Jin H. Zhang L. Zhu X. Xu

In 1993, a large radio telescope (LT, now referred as the SKA) was proposed by astronomers from 10 countries at the 24 th General Assembly of URSI. The SKA would be a telescope array with a total (effective) collecting area of about one square kilometer. There are various concepts, worldwide, for realizing the SKA project. Extensive efforts have been made, e.g., by project teams in The Netherla...

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