نتایج جستجو برای: land slope

تعداد نتایج: 167720  

Journal: :Environmental monitoring and assessment 2010
Zhanqiang Zhu Liming Liu Zhantao Chen Junlian Zhang Peter H Verburg

The main objective of this study is to evaluate the land-use change and its relationship with its driving factors in the loess hilly region. In this study, a case study was carried out in Pengyang County. We set two land-use demand scenarios (a baseline scenario (scenario 1) and a real land-use requirement scenario (scenario 2)) during year 2001-2005 via assuming the effect of driving factors o...

Journal: :Journal of environmental biology 2009
Orhan Dengiz Tugrul Yakupoglu Oguz Baskan

The objective of this research was to assess vulnerable soil erosion risk with qualitative approach using GIS in Ankara-Guvenc Basin. The study area is located about 44 km north of Ankara and covers 17.5 km2. The selected theme layers of this model include topographic factor, soil factors (depth, texture, impermeable horizon) and land use. Slope layer and land use-land cover data were prepared ...

Soil erosion and sediment yield from watersheds confine sustainable use of land resources and is supposed as one of the most critical environmental issues. Prediction of storm wise soil erosion and sediment yield is very important, especially in arid and semiarid regions due to small number of events and high intensity of rainfall. Evaluation of soil erosion by existing models is needed as an i...

2002
Hari Shanker Gupta

Hari Shanker Gupta Department of Geography University College, M.D. University Rohtak PIN-124001 (Haryana) INDIA PHONE : ++91-1262-59076 ® ++91-1262-74955 (O) FAX : ++91-1262 –74640 E-MAIL:[email protected] / ABSTRACT Geographic Information System (GIS) coupled with Remote Sensing has proved as a powerful tool in the field of land evaluation and managem...

2013
David Jon Furbish Joshua J. Roering

[1] A local formulation of the sediment flux on a hillslope describes the flux as a unique function of local hillslope conditions at any contour position x, whereas a nonlocal formulation must take into account nonlocal (upslope or downslope) conditions that influence the flux at x. Local formulations are reasonable when particle motions involve small length scales associated with localized bio...

2010
David Jon Furbish Peter K. Haff

[1] In soil‐mantled steeplands, soil motions associated with creep, ravel, rain splash, soil slips, tree throw, and rodent activity are patchy and intermittent and involve widely varying travel distances. To describe the collective effect of these motions, we formulate a nonlocal expression for the soil flux. This probabilistic formulation involves upslope and downslope convolutions of land sur...

ژورنال: علوم آب و خاک 2012
فرهاد خرمالی, , محمد عجمی, ,

In order to study land degradation from the soil genesis and micromorphological perspective, ten soil profiles were dug and described on five slope positions in both forest and deforested cultivated land. The soil samples were taken from all horizons for physico-chemical analysis and micromorphological studies. Forest soils had a well developed argillic and calcic horizons and also mollic epipe...

2009
Z. Chitu I. Savulescu

The shallow landslides affect most of the hillslopes in the Prahova Subcarpathians and are mainly caused by the agriculture practices. Though, these processes do not imply immediately losses for human activity, the landslide susceptibility assessment is necessary to prevent terrain degradation. The evaluation of landslide susceptibility requires understanding of spatial distribution of the fact...

The aim of this research is spatial Simulation and land subsidence susceptibility mapping using maximum entropy model in Jiroft and Anbarabad Townships. At first, land subsidence locations were recognized using extensive field surveys and subsequently the land subsidence distribution map was made in the geographic information system. Then, each of effective factors on land subsidence occurred i...

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