KEYWORDS: Floods, Geographic information systems, Meteorology, Hazard analysis, Agriculture, Data modeling, Chromium, Data conversion, Remote sensing, Analytical research
In this paper, according to the flood risk-influencing hazard of disaster-formatire factors, the stability of
hazard-pregnant environment and the vulnerability of hazard bearing body, the indexes of precipitation, runoff, river,
terrain, population and economy are considered. Taking, Henan Province as the focus area, and county as the
administrative unit, both the hazard assessment map and the vulnerability assessment map of the flood disaster are
acquired based on GIS and AHP integrated method. Finally, the comprehensive hazard evaluating map of the flood
disaster was drawn. The case study shows that the GIS-based category model is effective in flood risk zonation. Therefore the paper has a certain theoretical and practical significance.
To correct erroneous data arising from a variety of methods for monitoring soil drought, the paper presents the analysis of the
crop-canopy spectral characteristics and measured field moisture in the mid-late stage of wheat grain filling by means of observations
of synchronously monitoring drought at Satellite -airborne - in situ observation in an experiment made in the low land of the Yellow
River reach in a Zhoukou farm of the province on 23 May, 2009. Results suggest that (1) In the later time of wheat grain filling, there
was no clear absorption valley in the domain of 1175nm, and it is different from the spectral chart in the period of turning green to
heading. (2) There are data distortions in the domain of 1541nm and 2053nm which make out that the spectral in these domain are
disable for retrieved the wheat canopy character. (3) The relationship of one depth to adjacent is better and the soil moisture in deeper
depth could be deduced from its relationship with surface water content. (4) The retrieved results of FY-3A are not better than MODIS',
but the accuracy has been to meet the current demand for services, and can be applied to operation.
The endurance of summer maize to flood and the impacts of the flood on maize yields and its
components were studied in this paper. Obtain maize model for quantitative assessment of flood
disasters. Based on the GIS and EOS/MODIS water monitoring data, access to the flood disaster loss
model can be rapid quantitative assessment. The results showed that flood had obvious impacts on the
maize density, maize greenery, ear lengthen and thick, and the yields. The method can be used for fast,
accurate, continuous, dynamic monitoring and evaluation of flood hazards, for the development of
post-disaster planning.
Using Landsat TM and ETM+ images in 1993 and 2004 to interpret the variation of land use and vegetation cover in Zhengzhou area, a study is conducted on the current situation and change of desertification and vegetation cover during 1993-2004, indicating that the desertification has been under control, leading to the decline of the area and most of the waste land converted into arable land, but nevertheless vegetative coverage has dropped by 0.43% in this study period, and especially the woodland has greatly decreased, responsible for lowered vegetation area and vulnerable ecological environment. Some countermeasures are proposed against desertification and for expanding vegetation coverage in an effort to form a good ecosystem in the research area.
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