畦灌

On the basis of water balance model, a simplified analytic model of border irrigation is set up with the help of upper storage water coefficient.

根据水量平衡原理，通过引入地表储水形状系数和提出的公式所计算出的下渗水形状系数，建立了基于水量平衡原理的畦灌水流推进简化解析模型。

Border irrigation is a new kind of surface irrigation technique derived from the irrigation practice in the irrigation district in northern China.

小畦灌是我国北方一些灌区从灌溉实践中摸索出来的一种新型地面灌水技术。

Numerical model of border or furrow irrigation flow movement is a necessary tool and approach to design and evaluate surface irrigation systems.

数值模拟畦灌水流运动过程可为地面灌溉系统设计与评价提供必要的工具和手段。

Border irrigation can be described as elongated basins with a gentle slope in the long direction.

畦灌可以描绘成长条形的格田，沿其长边方向具有较缓的坡度。

The whole process of sophon surge flow border irrigation with pipeline is simulated.

对虹吸式波涌管道畦灌水流运动进行数值模拟。

Border irrigation can be used with slope gradients between 0.2 % and 2 % for cultivated crops, up to 4 % or 5 % for small grain or hay crops, and up to about 8 % for pastures.

适宜采用畦灌的地面坡度是：种植中耕作物为0.2％一2％；种植小粒谷物或饲料作物为4％～5％；种植牧草约为8％。

A simplified analytic model of border irrigation on the basis of water balance principle was set up and testified by some research results and field experiments. Results show that the model is simple and accurate, which can be used to determine the reasonable technical index of border irrigation.

结合已有文献资料和田间试验对模型进行检验，表明该模型具有计算求解方便、精度较高的优点，可用于畦灌合理灌水技术指标的确定。

Based on the field experiments, the daily variations of photosynthesis rate and transpiration rate and water use efficiency were compared on the condition of sprinkle irrigation and border flooding irrigation.

通过定点定位试验，比较了喷灌与常规畦灌条件下农田生态环境、冬小麦光合速率和蒸腾速率的日变化特征以及不同水平的水分利用效率。

Testified by some research results and field experiments, it is shown that the model is reasonable and has some advantages, such as strict physical foundation, simple calculation and solution, higher accuracy. So it can be used to decide the reasonable technical indexes of border irrigation.

结合已有文献资料和田间试验对模型进行检验，表明所提出计算下渗水形状系数的简化公式和经验公式是可靠的，以此建立的水流推进简化模型具有严谨的物理基础，且计算求解方便、精度较高，可用于畦灌合理灌水技术指标的确定。

Border irrigation current advancement process model plays an important role to determine irrigation technical index, average field infiltration rate and roughness coefficient.

畦灌水流推进过程计算模型对确定灌水技术要素、田间平均入渗率和糙率有十分重要的作用。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。