Analysis of Climate Characteristics and Advantages of Climate Resources in Zhangjiakou Region

By analyzing the climate characteristics of Zhangjiakou region,the advantages in its climate resources are explored.Analysis shows that abundant solar energy resources are the fundamental condition for promoting photovoltaic power generation projects and have become an important lever for poverty alleviation work;wind energy is one of the main climate resources in Zhangjiakou City,providing important conditions for the development of wind power generation industry;the Bashang region has a long duration of cold weather and long freezing time,which has not only the inherent climate advantage of conducting ice sports,but also the advantage of natural cold storage;the Bashang region has a long snowfall time,relatively more snowfall days,and a long snow accumulation time,which has a unique climate advantage for developing tourism culture with ice and snow sports as the theme;the climate characteristics of cold winter and cool summer,with natural cooling mechanism,are superior conditions for the development of large-scale modern data information industry.

Analysis on the Changes of Accumulated Temperature,Initial and Terminal Dates and Duration Days of Main Boundary Temperature in Zhangjiakou City

Global warming has become a topic of widespread attention. The climate change will affect the change of agricultural climate resource,thereby affecting the agricultural planting structure,the grain yield,etc. Based on the daily temperature of Zhangjiakou from 1960 to 2011,the temporal changes of ≥0 ℃ and ≥10 ℃ accumulated temperatures were analyzed by using the methods of linear trend estimation and M-K mutation test. The results indicated that(1) the annual average temperature showed an increasing trend with the linear warming rate of 0. 42 ℃ /10 a in the past 52 years. In 1982,the annual average temperature had abrupt change,especially after 1983,the warming trend increased significantly.(2) In the past 52 years,≥0 ℃ accumulated temperature showed an increasing trend with the warming rate of 89. 4 ℃ /10 a. Mutation point of ≥0 ℃ accumulated temperature appeared in 1983,and after 1985,≥0 ℃ accumulated temperature increased sharply. At the same time,the ≥10 ℃ accumulated temperature had abrupt change in 1983,especially from 1987 to 1995 and after 1986,the warming trend increased sharply.(3) The initial date of ≥0 ℃ presented significant advancing trend,and that of ≥10 ℃ had little change,while their terminal dates presented delaying trend,so the sustained days of ≥0 ℃ and ≥10 ℃ increased significantly.(4) In the past 52 years,the delay of the terminal dates of ≥0 ℃ and ≥10 ℃ was greater than the advancing of the initial dates,and ≥0 ℃ accumulated temperature had a greater increase than ≥10 ℃ accumulated temperature.

Climatic Change Characteristics of Thunderstorm in Zhangjiakou City

In order to understand the climatic change trend and characteristics of thunderstorm in Zhangjiakou City,and provide climate background basis for the thunder prevention and lightning disaster reduction in the region,observation data of the thunderstorm at Zhangjiakou ground meteorological station from 1960 to 2013 were statistically analyzed by linear fitting,climate trend rate,M-K test,guaranteed rate method and so on. The results showed that the average annual thunderstorm days reached 37. 7 d in Zhangjiakou City from 1960 to 2013,and was in the moderate thunderstorm range. In nearly 54 years,thunderstorm day was reducing at the rate of about 1. 21 d /10 a in the city. There was thunderstorm in other three seasons except winter,and thunderstorm frequently occurred in summer. Summer thunderstorm day was reducing at the rate of about 1. 29 d /10 a,which caused the reduction of the annual one. In summer,thunderstorm day of July reduced most significantly. There were two key points of abrupt reduction,which occurred in 1971 and 1998,on the change of thunderstorm days in Zhangjiakou in recent 54 years. The first thunderstorm date had an advancing trend in recent years,while the final date had not an obvious change. The possibility of thunderstorm was very small from late October to next March in Zhangjiakou City. The first thunderstorm date occurred mostly before middle May,and the period from middle and late May to early and middle September was the high incidence of thunderstorm. The thunderstorm occurred mostly in the NW direction,with the least in E and SE directions,and dissipated mostly in SE direction,with the least in NW and W directions.

Climate Analysis during Growth Period of Tobacco in Yuxian and Meteorological Disaster Defense

By analyzing climate condition during growth period of tobacco in Yuxian,scientific and reasonable production management measures are made. For meteorological disasters during growth period of tobacco,corresponding defense measures are put forward. It could provide the basis for further conducting meteorological service of tobacco,and the meteorological guide for farmers improving tobacco planting quality and decreasing the loss caused by the disastrous weather.

Analysis on the Gale and Dust Weather in Zhangjiakou City on May 11,2011

On May 11,2011,the gale and dust weather appeared in Zhangjiakou City. By analyzing the conventional meteorological data,it was found that the gale and dust weather occurred by the combined effect of the cold air splitting from the bottom of the high-altitude cold vortex and the Mongolian cyclone. The strong cold advection in the middle and lower layers provided the gale weather with driving force. The humidity conditions at middle and lower layers in Zhangjiakou City and its upstream region contributed to the weather process. Finally,the strong and wide rise district provided a more favorable power condition for the maintenance and transmission of the dust to the eastern region.

Reflection on China's Disaster Prevention and Mitigation Construction after Rainstorm and Snowstorm

On July 10,2004,Beijing was hit by the rainstorm that has not been seen for many years,which caused water accumulation in many places of the urban area,power supply interruption in many places,and traffic paralysis for nearly 5 h. On July 12,2004,the rainstorm in Shanghai lasted less than 1 h,but it caused 7 deaths,more than 20 injuries,extensive power outages and traffic paralysis. At the end of 2005,the continuous snowfall in Weihai City of Shandong Province for half a month caused direct economic losses of over 200 million yuan,and the continuous heavy snowfall had a serious impact on people’s lives. From July 17 to 23,2021,Henan Province suffered a rare extremely heavy rainstorm in history,with a direct economic loss of 120.6 billion yuan. Faced with such urban meteorological disasters and other types of urban disasters,combined with the current situation of disaster prevention and reduction in China,what will managers,decision-makers,and experts and scholars think about from them.

Review of Theory and Methods of Image Segmentation

Image segmentation refers to the technique and process of partitioning a digital image into multiple segments based on image characteristics so as to extract the object of interest from it. It is a key step from image processing to image analysis. In the mid-1950 s,people began to study image segmentation. For decades,various methods for image segmentation have been proposed. In this paper,traditional image segmentation methods and some new methods appearing in recent years were reviewed. Thresholding segmentation methods,region-based,edge detection-based and segmentation methods based on specific theoretical tools were introduced in detail.

One-dimensional Mathematical Model of Numerical Simulation of Urban Heat Island

With the development of society and the acceleration of urbanization, urban heat island phenomenon is becoming increasingly prominent. In this paper, enrichment capacity of plant light energy is supplemented based on OKe model according to law of energy conservation. By contrasting each component of energy balance equation between the cities and rural areas, the causes for urban heat island are explained.

Overview of Land Use/Cover Change Dynamic Monitoring Methods

With the emergence of global environmental change issues,Land Use/Cover Change(LUCC)issues have received increasing attention.Therefore,the dynamic monitoring of LUCC has also become very important.In this paper,preliminary exploration was made to the research progress on the dynamic monitoring technologies for LUCC as well as their advantages and disadvantages,and prediction was made to the development trend of future monitoring technology.