NILSON METHOD AND ITS OPTIMIZATION TO DETERMINE THE TYPOLOGY OF LAND SLIDE DANGER

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SHARIFI R.; DARYABARI J.

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Journal: GEOGRAPHICAL RESEARCH Year:2005 | Volume:20 | Issue:1(76) Page(s): 78-89

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Title

NILSON METHOD AND ITS OPTIMIZATION TO DETERMINE THE TYPOLOGY OF LAND SLIDE DANGER

Author(s)

SHARIFI R. | DARYABARI J. | Issue Writer Certificate

Keywords

LAND SLIDEQ2

TYPOLOGY OF LANDSLIDE RISKQ4

NILSON METHODQ4

WATERSHEDQ4

CHASHAM KHATIR KOH AREAQ2

SEMNANQ2

IRANQ2

Abstract

To determine land typology on the basis of landslide variable and to prepare a map using NILSON METHOD, a case study has been done. The area is located in the north of SEMNAN, in Chashm Khatir Koh. First the exact area for the study was determined and all LAND SLIDEs in the region were recorded. Point distribution and surface distribution maps were prepared. Then, on the basis of NILSON METHOD, the slope of slide was drawn on a map at the levels of; 0-5, 5-15 and more than 15 percent and also the geological map was drawn. Then maps for three classes of minor slide or no slide units, slide units and units with slide potentials, were prepared. On the basis of NILSON METHOD, comparing and combining two maps (slope and slide units), typology map of LAND SLIDE with five units:stable, generally stable, fairly stable, fairly not stable and areas with mudflow potential were drawn. The land area for each classification are consequently 62, 18, 690 and 94 hectare. The result of the study showed that NILSON METHOD cannot be recommended for the region because the stable land area, fairly not stable land area and fairly not stable are more frequent than the rest. Another deficiency with this method is the existence of stable area for lands with the slope of less than 5 percent. To overcome this deficiency,slope classification was grouped into five classes on the basis of LAND SLIDE distribution:less than 5, 5-15, 15-25, 25-45 and more than 45. On the basis of conformation and comparison of new slope map and geology map, typological map LAND SLIDE at five levels: stable, generally stable, fairly stable, fairly not stable and with mudflow potential was prepared. LAND SLIDE area for each of these levels are respectively 57,263,394,652 and 94 hectare which are fairly acceptable to be recommended to the administrative sectors in the region.

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APA: Copy

SHARIFI, R., & DARYABARI, J.. (2005). NILSON METHOD AND ITS OPTIMIZATION TO DETERMINE THE TYPOLOGY OF LAND SLIDE DANGER. GEOGRAPHICAL RESEARCH, 20(1(76)), 78-89. SID. https://sid.ir/paper/29915/en

Vancouver: Copy

SHARIFI R., DARYABARI J.. NILSON METHOD AND ITS OPTIMIZATION TO DETERMINE THE TYPOLOGY OF LAND SLIDE DANGER. GEOGRAPHICAL RESEARCH[Internet]. 2005;20(1(76)):78-89. Available from: https://sid.ir/paper/29915/en

IEEE: Copy

R. SHARIFI, and J. DARYABARI, “NILSON METHOD AND ITS OPTIMIZATION TO DETERMINE THE TYPOLOGY OF LAND SLIDE DANGER,” GEOGRAPHICAL RESEARCH, vol. 20, no. 1(76), pp. 78–89, 2005, [Online]. Available: https://sid.ir/paper/29915/en

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