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MONITORING FARMLAND LOSS CAUSED BY URBANIZATION IN BEIJING FROM MODIS TIME SERIES USING HIERARCHICAL HIDDEN MARKOV MODEL
Urban Encroachment onto Farmland Time Series Change Detection Hierarchical Hidden Markov Model (HHMM)
2018/5/16
In this study, we proposed a method to map urban encroachment onto farmland using satellite image time series (SITS) based on the hierarchical hidden Markov model (HHMM). In this method, the farmland ...
非充分供水与充分供水入渗模型参数间关系试验（Experiment on Relations of Infiltration Model Parameter in Non-sufficient and Sufficient Water Supplies）
非充分供水 充分供水 Kostiakov三参数模型
2010/12/29
基于均质土壤的非充分供水与充分供水入渗试验数据，分析了非充分与充分供水入渗过程之间的关系，建立了非充分与充分供水入渗Kostiakov三参数模型参数之间的关系。结果表明：非充分供水积水后入渗过程以充分供水入渗过程为渐近线；非充分与充分供水入渗参数α的比值m随着供水强度的增加而增大、随着黏粒含量的增加而增加、随着砂粒含量的增加而减小、随着土干密度的增加而增加、随着初始含水率的增加而减小，它们之间都较...
Testing the Residuals of an ARIMA Model on the Çekerek Stream Watershed in Turkey
ARIMA model Monthly streamflow Clekerek stream Diagnostic checks
2009/10/10
In ARIMA modeling studies, the selection of a best model t to historical data is directly related to whether residual analysis is performed well. Therefore, diagnostic checks including the independen...
膜孔灌平均入渗水深简化计算模型建立与验证（Simplified Infiltration Model of Film Hole Irrigation and Its Validation）
膜孔灌 入渗速率 膜孔直径
2009/9/11
以非饱和土壤水分运动理论为基础，研究了膜孔灌土壤水分运动的数学模型，并用SWMS—3D软件对多种典型土壤的膜孔灌入渗特性进行模拟，利用模拟结果分析了膜孔灌入渗特性及其影响因素，提出了包含开孔率、膜孔直径的膜孔灌点源平均入渗水深简化模型。采用多种土壤膜孔灌入渗室内试验结果与已有文献资料对所建模型进行验证，结果表明所建模型能较准确地反映膜孔灌点源入渗特性，可为确定合理的膜孔灌灌水技术要素组合提供理论依...
畦田Philip入渗参数和田面综合糙率同步推求（Synchronously Determining Philip Infiltration Parameter and Synthesis Roughness Model of Border Irrigation）
畦灌 土壤入渗参数 田面综合糙率
2009/8/11
以水量平衡原理为基础，通过对畦灌地表水面线的概化，并将Philip入渗公式等同为α=0.5的Kostiakov修正模型，由此建立了利用畦灌水流推进过程同步推求Philip土壤入渗参数和田面综合糙率的模型。结合文献资料和大田试验对所建模型进行验证，并采用Matlab软件求解，得出不同地表储水形状系数σh下的入渗参数和糙率，并分别对入渗参数和田面综合糙率的可靠性进行了验证，结果表明所建模型同步推求土壤...
Hydraulic Conductivity Evaluation for a Drainage Simulation Model（DRAINMOD）
Hydraulic conductivity DRAINMOD runoff drain discharge
2009/1/13
The objective of this study was to determine the most suitable saturated hydraulic conductivity (K) values as input into DRAINMOD among a range of K data sets developed for the drainage experiment si...
Development of a Mathematical Model Using Dimensional Analysis for Predicting the Friction Losses in Drip Irrigation Laterals with Cylindrical Type In-Line Emitters
Drip irrigation emitters friction loss mathematical model dimensional analysis
2009/1/13
This paper presents a prediction model developed using dimensional analysis for friction losses in drip irrigation laterals. Drip irrigation laterals with cylindrical type in-line emitters placed at d...