需水量

沙漠绿洲区春小麦需水量及需水规律探讨

Study on water demand and its regulation of spring wheat in the oasis of desert

本文计算了北京的可能蒸散量和农业需水量，并比较了农业需水量和水资源量的差额。

In this paper , the potential evapotranspiration and agricultural water demand are calculated , and the agricultural water demand is compared with water resources in Beijing .

基于MATLAB神经网络的水稻需水量的预报模型

Predictive Model of Water Requirement of Paddy Base on MATLAB Neural Network

基于GIS和PCA的冬小麦需水量影响因子分析

Analysis of dominant factors of winter wheat water requirements based on GIS and PCA

北京房山节水灌溉区作物需水量（ET）的计算与研究

Evaluation and Research of Crop Water Requirements ( ET ) in the Water-saving Irrigation Area of Beijing Fangshan

等维新息GM（1,1）模型在郑州市城市生活需水量预测中的应用

Application on Grey Information Renewal GM ( 1,1 ) Model for Predicting Urban Life Water Demond of Zhengzhou

另外Df与磨细灰的需水量比有一定的相关性。

The relationship between the water requirement and Df is revealed .

预测陕西关中地区需水量的改进GM（1,1）模型

Modified GM ( 1,1 ) model for predicting the water resource demand in the Guanzhong Region , Shaanxi Province , China

根据灰色系统理论的灰色模型（GreyModel）与时间序列方法ARMA模型，提出了水稻各生育期平均日需水量预测的时间序列综合模型。

In accordance with the Grey Model derived from Grey System Theory and ARMA Model , a comprehensive time sequence model for predicting daily water requirement in paddy rice is developed .

该软件用于辅助管理单位进行水量申报的管理工作，能够访问Access数据库，读取相应数据，计算各个时刻的需水量，并确定应缴纳的水费。

This software can be used in the water order information management through visiting Microsoft Access database , retrieving the ordering information , calculating the water demand at given time , and determining the corresponding water fees .

2003年流域农业总耗水量为17.61亿m3，流域总净灌溉需水量为13.03亿m3。

In 2003 , the total agricultural water consumption is 1.761 billion m3 , and total net irrigation water requirement is 1.303 billion m3 .

Fertigation能够减少水分和养分损失，降低总需水量，提高养分利用率。

Fertigation can increase water and nutrient use efficiency by lowering water and nutrient losses .

在对辽宁省营口市城市需水量预测中，采用BP人工神经网络方法对该市人均综合用水量进行预测，进而预测出城市需水量，取得了满意效果。

The BP method of artificial neural network is used for predicting the comprehensive water requirement per capita of Yingkou city of Liaoning province . The result shows water demand of city can be forecasted .

研究森林蒸散耗水的生态机理与不同类型林木的耗水规律，结合遥感和GIS在测量与计算植被生态需水量的应用，提高区域林木需水量的计算精度；

We should study ecological mechanism of forest evapotranspiration and water consumption regularity of different forest tree , and combine remote sensing and GIS to measure and count forest tree ecological water requirements and raise accurate of it ;

分析了不同降雨频率下，灌区主要作物的需水量与需水规律，并采用降雨灰色灾变预测GM（1,1）模型间接地预测了作物需水量。

The crop water requirement and its rule on different frequency of rainfall are analyzed in the paper , and the crop water requirement is indirectly predicted by the Grey Disaster Model of rainfall .

以小波函数代替传统BP网络中的S型激活函数，对水稻需水量序列在不同的分辨率下进行调节，得到更加详尽的细节信息，掌握需水量的变化规律。

Replaced the traditional S-shaped activation function with the wavelet function , the series of water required must be regulated under different resolution to obtain more detailed information and master the variation of the amount of water required .

用联合国粮农组织（FAO）最新推荐的彭曼－蒙蒂斯模式（FAO－PM）计算甘肃河东10个代表站点的冬、春小麦的需水量。

Stations ' wheat Crop Water Requirements ( CWR ) in Hedong Region of Gansu Province were calculated applying the FAO Penman Monteith equation ( FAO PM ) provided by UN FAO .

运用BP网络预测模型、GM（1，1）模型和趋势移动平均预测模型，预测了各规划年需水量，为区域节水最优规划的制定提供依据。

The BP neural network-forecasting model , GM ( 1,1 ) forecasting model and moving tendency forecasting model are adopted to forecast water requirement of every planning year and provide the basis for the optimal programming of regional water conservation .

在对传统的需水量预测方法进行分析后，选取灰色预测模型、BP神经网络和支持向量机分别进行预测。

After analyzing the traditional water demand forecasting methods , three methods were selected . They are gray model , BP neural network and support vector machine . First , the raw data was tested if it met the gray forecast feasibility .

如果埃及所有的谷物都由自己种植，所需水量将占阿斯旺（Aswan）大坝水库蓄水量的六分之一。

If Egypt grew all its own cereals , it would require one-sixth of the water in the Aswan dam reservoir .

本文选择沧州为代表城市，针对传统需水量预测方法存在的问题，引入BP神经网络&灰色组合预测模型对城市需水量进行预测。

On the basis of these analyses of Cangzhou , a combined predictive model of BP neural network-gray has been put forward to predict the urban wastewater quantity and wastewater regeneration demand , taking the existing problem of traditional water demand predictive methods into consideration .

本文以计算得到的作物需水量为目标输出，气象因子为网络输入，建立了作物需水量预测的BP网络模型。

And then , actual crop water requirements can be reckoned . This study uses actual crop water requirements which have already been calculated as target outputs , weather factors as inputs , to establish the BP neural network model of crop water requirements forecast .

得到生态系统可能实际利用的径流性水资源量GR。将生态需水量GE与生态系统可能实际利用的水资源量GR进行平衡分析，计算实际生态耗水，并分析盐碱地无效耗水。

By the balancing analysis between the ecological water demand GE and the available water supply GR , we can calculate the actual ecological water consumption and analyze the unavailable water consumption in the saline land .

该文利用FAO推荐的作物系数乘以参考作物蒸散量的方法计算了华北地区6个站点近50年主要作物的需水量，并并分析了其变化趋势。

Crop water requirements of winter wheat and summer corn in North China in recent 50 years were calculated by the FAO approach , which equaled to crop coefficient ( multiplied ) by reference crop evapotranspiration .

主要影响因子作为BP人工神经网络的输入，灌区的需水量作为ANN输出，建立灌区需水量预测的BP人工神经网络模型。

The main influence factors was used as the input of artificial neural network ( ANN ), the water requirement of the irrigation was used as the output of artificial neural network ( ANN ), and then the ANN model about water requirement forecast was set up .

计算表明，洪河国家级自然保护区湿地最小生态环境需水量为1.02亿m3，优等生态环境需水量为1.95亿m3。对于水，它约为4×10~3大气压。

Results showed that the minimum eco-environmental water consumption for Honghe National Nature Reserve wetlands was 1.02 × 108m3 , and the optimum water consumption was 1.95 × 108m3 . It was a formidable task to meet this water demand .

计算结果表明，海滦河流域生态需水量为124×108m3，约占流域地表径流总量的54%。

The calculated result shows that eco-environmental water demand in Haihe and Luanhe Basin is 12.4 billion m3 , about 54 % of total basin surface runoff .

UWBⅡ型水下不分散混凝土比UWBⅠ型具有更优良的适应性，对不同产地的水泥及砂石料可保持混凝土的品质稳定，不导致反常的需水量增大。

UWB ⅱ possesses the more excellent compatibility compared with UWB ⅰ, the more stable fresh concrete can be made by different coarse and fine aggregate and cement produced in different factories , the abnormal increasing in mix water of concrete can not be produced .

品质好的粉煤灰应该是：烧失量小，SO3含量少，细度和需水量比低。

Fly ash having good quality should be that it has a little loss on ignition and content of SO_3 , its fineness and water demand ratio are low .

本文探讨了生态环境需水量和生态修复的内涵，并对IFIM方法的理论进行了详细的研究。

The dissertation discussed the theoretical connotation of eco-environmental water demands and ecological restoration , and studied the theory of IFIM in detail .