Controls of land use and soil structure on water movement: Lessons for pollutant transfer through the unsaturated zone

This research aims to get the data, manage, analyze and discuss the characteristics of the study of Agricultural Land in Sembalun visits: 1 ) Characteristics of agricultural land, 2) Level of agricultural land suitability. This type of research is quantitative. This study population across the districts in East Lombok, amounting to 20 District of the District Keruak, Jerowaru, Sakra, Sakra West, Sakra East, Terara, Montong Ivory, Sikur, Masbagik, Pringgasela, Sukamulia, Suralaga, Selong, Labuhan Haji, Pringgabaya , Suela, Aikmel, Wanasaba Sembalun and Sambelia. Sampling in this study using Purvosive Sampling. Samples are Sembalun subdistrict. Mechanical Analysis by objective research of agricultural land characteristics observed descriptively and databulasi of the field data belongs to the growing requirements of agriculture which can be seen from the slope, soil structure, slope length, slope shape, texture soil, land use criteria. The research found that: 1) Characteristics of agricultural land in Sembalun, had several criteria: a slope in the category Sembalun including steep or less suitable for agriculture by 46-65% kemiringin slope, soil to soil Sembalun criteria granular, blocky or appropriate agricultural land and have long used the medium to long 15-50m, soil texture Sembalun criteria belong to the category of rough because it is composed by sand-plated, dusty sand, slope shape in Sembalun belong to the variation convex with dignity 2 for observation location along notching it is always a convex slope, land use Sembalun belong to the criterion of berlukar / mixed farms with dignity 2. Because along the way, the land berlukar / mixed farms. 2) Suitability of farmland in Sembalun based on the results of pengharkatan to 6 land characteristics, the number value obtained was 12 with class suitability for agricultural land belonging to the class I (land suitable for agriculture).

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Unsaturated zone tritium and chlorine 36 profiles from southern Australia: Their use as tracers of soil water movement

Water Resources Research ◽

10.1029/94wr00161 ◽

1994 ◽

Vol 30 (6) ◽

pp. 1709-1719 ◽

Cited By ~ 76

Author(s):

P. G. Cook ◽

I. D. Jolly ◽

F. W. Leaney ◽

G. R. Walker ◽

G. L. Allan ◽

...

Keyword(s):

Soil Water ◽

Unsaturated Zone ◽

Water Movement ◽

Chlorine 36 ◽

Soil Water Movement

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The Influence of Soil Structure on Water Movement, Crop Root Growth, and Water Uptake

Advances in Agronomy - Advances in Agronomy Volume 38 ◽

10.1016/s0065-2113(08)60674-4 ◽

1986 ◽

pp. 95-158 ◽

Cited By ~ 138

Author(s):

Ann P. Hamblin

Keyword(s):

Root Growth ◽

Water Uptake ◽

Soil Structure ◽

Water Movement ◽

Crop Root

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Towards a simple representation of chalk hydrology in land surface modelling

Hydrology and Earth System Sciences ◽

10.5194/hess-21-459-2017 ◽

2017 ◽

Vol 21 (1) ◽

pp. 459-471 ◽

Cited By ~ 9

Author(s):

Mostaquimur Rahman ◽

Rafael Rosolem

Keyword(s):

Land Surface ◽

Unsaturated Zone ◽

Large Scale ◽

Management Practices ◽

Preferential Flow ◽

Water Movement ◽

Model Parameters ◽

Catchment Scale ◽

Surface Modelling ◽

Land Surface Modelling

Abstract. Modelling and monitoring of hydrological processes in the unsaturated zone of chalk, a porous medium with fractures, is important to optimize water resource assessment and management practices in the United Kingdom (UK). However, incorporating the processes governing water movement through a chalk unsaturated zone in a numerical model is complicated mainly due to the fractured nature of chalk that creates high-velocity preferential flow paths in the subsurface. In general, flow through a chalk unsaturated zone is simulated using the dual-porosity concept, which often involves calibration of a relatively large number of model parameters, potentially undermining applications to large regions. In this study, a simplified parameterization, namely the Bulk Conductivity (BC) model, is proposed for simulating hydrology in a chalk unsaturated zone. This new parameterization introduces only two additional parameters (namely the macroporosity factor and the soil wetness threshold parameter for fracture flow activation) and uses the saturated hydraulic conductivity from the chalk matrix. The BC model is implemented in the Joint UK Land Environment Simulator (JULES) and applied to a study area encompassing the Kennet catchment in the southern UK. This parameterization is further calibrated at the point scale using soil moisture profile observations. The performance of the calibrated BC model in JULES is assessed and compared against the performance of both the default JULES parameterization and the uncalibrated version of the BC model implemented in JULES. Finally, the model performance at the catchment scale is evaluated against independent data sets (e.g. runoff and latent heat flux). The results demonstrate that the inclusion of the BC model in JULES improves simulated land surface mass and energy fluxes over the chalk-dominated Kennet catchment. Therefore, the simple approach described in this study may be used to incorporate the flow processes through a chalk unsaturated zone in large-scale land surface modelling applications.

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