Modeling flow and chemical quality changes in an irrigated stream‐aquifer system
Modeling flow and chemical quality changes in an irrigated stream‐aquifer system
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模拟灌溉水流-含水层系统中的流量和化学质量变化
DOI：
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发表时间：
1974
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影响因子：
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通讯作者：
J. Bredehoeft
中科院分区：
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作者：
L. Konikow;J. Bredehoeft
科罗拉多州东南部阿肯色河谷地下水和地表水盐度增加主要与灌溉措施有关。开发了数字计算机模型来预测溶解固体浓度的变化，以响应空间和时间变化的水文压力。描述地下水瞬态流动以及溶解化学成分的迁移和分散的方程得到了数值求解。该模型模拟了溪流和含水层的流量以及水质变化。使用一年来对拉洪塔和本特-奥特罗县线之间 11 英里的山谷进行的详细现场测量来验证和校准该模型。在研究期间，测量的水位平均变化约 3 英尺，计算得出的含水层地下水位高度在大约 90% 的时间里与观测值的误差在 1 英尺以内。一个井场5口井水样的电导率标准偏差约为平均值的10%。大约 80% 的时间里，模型计算出的溶解固体浓度与含水层和河流的观测值的误差在 10% 以内。
Salinity increases in groundwater and surface water in the Arkansas River valley of southeastern Colorado are primarily related to irrigation practices. A digital computer model was developed to predict changes in dissolved solid concentration in response to spatially and temporally varying hydrologic stresses. The equations that describe the transient flow of groundwater and the transport and dispersion of dissolved chemical constituents were solved numerically. The model simulated flow as well as changes in water quality for both the stream and the aquifer. Detailed field measurements made for a 1-yr period in an 11-mi reach of the valley between La Junta and the Bent-Otero county line were used to verify and calibrate the model. Measured water levels varied by an average of about 3 ft during the study period, and calculated water table elevations in the aquifer were within 1 ft of the observed values approximately 90% of the time. The specific conductances of water samples from five wells in one well field had a standard deviation of about 10% of the mean. Dissolved solid concentrations calculated by the model were within 10% of the observed values for both the aquifer and the stream approximately 80% of the time.