| Soil erosion refers to the process of destruction,denudation,transport and deposition of soil and its parent material under the action of hydraulic force and wind force.Soil erosion is one of the most common causes of soil degradation,about 80% of the world's land is eroded,soil erosion has reached 1 billion 94 million hectares,of which serious erosion of up to 751 million hectares.Heavy rain or rainstorm has a strong impact on soil,large runoff and erosion,which often cause serious soil erosion.In recent years,soil erosion is becoming more and more serious in china,the worsening situation of the land is getting more and more attention from all walks of life.Soil erosion is one of the most widely distributed and the most serious soil erosion in China.The total area is 17% of the land area.Surface runoff caused by rainfall or freezing and thawing is the main way of soil erosion.At present,there are many scientific research departments and government units in our country studying on soil erosion in different regions,It is of great significance on the ecological protection,agricultural production and rational use of land.Due to the relatively late development of soil and water measurement in China,most of the devices in soil and water measurement and acquisition in China are imported from abroad,the domestic water and soil loss monitoring department have to spend a lot of money to buy foreign equipment every year.Therefore,the localization of soil and water loss sampling equipment is of great significance,our goal is to further improve the equipment at the same time combined with the actual research and work requirements,and product better quality with lower prices of high-quality products,with independent intellectual property rights.In order to solve the problem of transmission inconvenience caused by cable data transmission in runoff plot sampling,this paper designs a low power flow and soil erosion sampling system based on the wireless local area network(ZigBee)technology,which is used to collect the surface runoff samples and record the sampling time of runoff.The device uses the CC2530 microprocessor of TI company as the core controller,which is responsible for the wireless data transceiver and sampling device control.The system consists of a wireless handset and a plurality of runoff sampling devices.As the central node,the handset is responsible for the management of the whole network and the control of each sampling device,the runoff sampling device is used as the network node to separate the runoff automatically according to the sampling rules set by the central node.To set up the sampling rule of the runoff,two methods of manual setting and intelligent setting are realized.Intelligent setting mode using fuzzy logic control algorithm based on fuzzy mathematics,according to the real-time rainfall intensity and runoff intensity information,the expert knowledge base is established,and the corresponding fuzzy reasoning is given.This system uses the 12 V lead acid battery as the power supply,and realizes the low power design of the hardware and software.Through the field experiment of the flow field,and combined with the experimental results and data,it is proved that the system has the advantages of convenient operation,good stability and high reliability. |
PDF Full Text Request